Ok so since that you asked me through chat about any advice that I can give to you for your fan fiction series, here's what I have. Sure, much of this is just my opinion and you have a choice to not follow my suggestions here. Still, I think it's something that you should take note of if you want to write a better story.
First off, try not to be too ridiculous and absurd. When I read your part 1 page about how you would reboot Ben 10, the part where you state how Vilgax would acquire a sample of DNA from Max Tennyson and some samples from the Omnitrix and would plan to create his own warrior with its own Omnitrix is an example of what I mean by that. To me, I find that to be a moment of "Wait...what? Why?". It sounds too ridiculous and absurd even for Ben 10 standards. I rather watch Innervasion again than see something like that. Also, if Vilgax is after the Omnitrix, he's after it for a reason. Vilgax knows some aspects about the Omnitrix but he doesn't know how to make one himself. Otherwise, he wouldn't even be bothering at all with going after Ben. It also presents the issue of making the original Omnitrix seem less unique because, well, now there's another Omnitrix. That was an issue that I had with the sequel shows introducing stuff like the Ultimatrix, the OV Omnitrix, the Nemetrix, etc. It made the original Omnitrix feel less unique. For more on that, here's my article on what I think are ways to fix and improve the Omnitrix: https://ben10club.org/topic/373/ben-10-how-to-fix-and-improve-the-omnitrix. So yeah, again, try not to get too ridiculous and absurd. That's a common issue that I've seen with many Ben 10 fanfics. The same goes with the notion of Max and Vilgax being former friends and how Max was some galactic war veteran that nearly wiped Vilgax's species to near extinction. That sort of stuff just sounds too ridiculous and absurd, again, even for Ben 10 standards. That's not to say that they can't work though. To me, it just doesn't sound right for Ben 10.
Second, I say that you should ditch the road trip approach. Take that direction and burn it. I said this before in your part 1 page, we already have the Original Series. Such a direction has already been tackled before and in a much better way and considering that the Ben 10 reboot is reusing that very same premise of Ben, Gwen, and Max going on a summer road trip makes such a premise feel overused now. I also recall seeing other fanfic writers reuse that premise many times themselves, which, again, points to the issue that this very premise feels overused. In your part 2 page, you say that the road trip approach has a greater amount of variety in what the characters experience. What variety? The Original Series already used up most, if not all, of that variety. The reboot had to reuse plot elements from the previous shows to add content. In fact, often times the characters in the reboot show are revisiting locations that they already visited. It's either that or they're visiting locations that are quite similar to locations that they already visited before. Many scenarios are being repeated as well in the reboot. At this point, there is no variety left in the summer road trip approach. Again, as I stated in your part 1 page, the reboot's reuse of that very premise contributed greatly to making the show itself feel very much unnecessary to exist and considering that there are plenty enough of Ben 10 fanfics that also use that premise as it is already, if you were to reuse the road trip premise, your fanfic series isn't going to feel unique. It won't stand out much. It would feel very much unnecessary and would likely be drowned out by the fact that we have an official Ben 10 show that already does this premise and does it better. What I would suggest is for you to branch out into other directions. Try to do something different. Try to go for a premise that is more different and stands out more. Try to go for a premise that we haven't seen out of Ben 10. You can use some elements from each of the Ben 10 shows but it's also important to try and do something more different, unique, and interesting with a premise.
Of course though, none of that matters if your writing skills aren't, well, good. This is where YouTube can come into great use. You should do some research. Learn how to improve your writing skills. Learn about structure and execution and whatnot. In the case of YouTube, I suggest looking up well credited reviewers and critics of films, shows, video games, books, etc. Look up analysis videos that go in-depth into these types of works and what makes many of them stand out. Some YouTube channels that I would recommend are Every Frame a Painting, Rossatron, Raycevick, Chris Stuckmann (especially his analysis videos), Jeremy Jahns, Now You See It, etc. Contact these folks as well if you want to get some more advice on how to make good writing. Always do some research into matters like this to help further improve your writing skills. There's always going to be something new that you're going to learn from this stuff. On FanFiction.net I believe there are beta readers. When it comes to writing your fanfics, have these people proof read your works and give you suggestions (if you plan on posting your fanfic series on that website though). After posting your fanfic, any reviews that you get, take note of any criticism that people direct towards your story. I know that you're not going to like people criticizing your work but, and as I said to you plenty of times before, criticism is an important tool to use in order to fix any issues that your works have and thus further improve your skills and the quality of your works. You need to know what you did wrong so that you can make things right.
You likely know this already but my most favorite Ben 10 fanfic series is Little Moments created by shadows59. Even if you're not a fan of the Bwen shipping, I highly recommend that you check this series out. It does a lot of really interesting and unique elements to it. Often times, the series does stuff that's better than the actual canon. For example, the prequel chapter, Stone in the River by Erico, introduced Professor Paradox but unlike the actual canon, this prequel chapter takes a much different approach to him and the concept of time traveling. The first time I read that chapter, it blew me away with just how interesting and unique the lore and story was. I find this version of Professor Paradox to be more interesting, unique, and mysterious than the official version. Here is a link to the page that provides all the links to the Little Moments series: https://ben10club.org/topic/183/little-moments-and-breaking-point. I suggest starting off with Stone in the River since that, well, it's a prequel chapter to the main story and a great predecessor to the Ben 10,000 episode in the Original Series. I say the Little Moments series is a great example of what I'm referring to with the suggestions that I'm providing here. Something that doesn't get too ridiculous and in fact often feels quite real with the way that the story, characters, and lore are written and implemented. Something that branches off into its own interesting and unique direction that makes it stand out. Something that has a lot of quality to it that you can learn from. I also need to get back to giving this series another read again because christ it's so freakin good.