Hello! :D
I think the most important thing to keep in mind, based upon my personal history with burnout, is that your work doesn't have to be perfect. (After all, wikis are rarely a solo undertaking - like all of the good wikis are the product of many, many little iterations by a bunch of people!)
If all you do is save what you can find before it succumbs to link rot; if all you do is install the Archive.org extension and click save website, then CONGRATS, you have done a neat thing! So that is where, personally, I would begin: save/archive a bunch of stuff in case future you or future someone else feels up to the task of doing something with it.
From there? Perhaps a linkdump - literally just a page with a bunch of links to the neat stuff you've found. They can be extensive and organized (example: this plurality linkdump by @monsterqueers) but they can also be just like... a Rentry page where you've thrown everything for people to rummage through, and you can organize it and pretty it up some other time.
So I guess the moral of the story here is like, if it all feels overwhelming, don't feel afraid to just half-ass it? Even if that means like, half-assedly tossing a bunch of links into a page, walking away from it for several months, and then coming back to put them into slightly more organized piles. That's part of the beauty of this work, I find!
(fallen london stamps by