I know that feel, bro. Wayback Machine is very spotty, unfortunately. websites that existed for years often have only a few pages archived.

the worst thing I saw was a website that was dead for over a decade but fully archived get hit with "Sorry. This URL has been excluded from the Wayback Machine" because of robots.txt set by whoever is squatting the domain now. I've managed, by some miracle, find an archive of its content on some random forum. bookmarked it. by the time I'd remembered about the bookmark, that random forum was dead and the link was not archived :(