"This gallery features a collection of the 50,000 most popular* movies according to TMDB"
Yeah, there's the problem. I went to the TMDB site and tried sorting by popularity, rating … all I got was a whole bunch of recent films that look like all the reasons the film industry is crashing (you know, the kind of stuff you would see in a Red Box when they were still a thing).
If you really don't know what to watch you could do a lot worse than checking off films on this list (the 1001 Movies to See Before You Die):
https://1001films.fandom.com/wiki/The_List
(And you have already seen a number of them I expect.)
Elitist? Maybe. But if you can actually get through the list (I've been at it, casually, for several years now) you'll feel like you have acquired a film school degree.
I think it's fine to watch "8 ½" and hate it — at least you'll know that you hate it now. But it would be sad if you never saw "La Strada" because you thought all of Fellini's films were impenetrable.
"Marty", "Stella Dallas", "The Hustler" — just a few great American films that came to mind that I would have otherwise missed…
But if the latest Guardian of the Pirate's of the Marvel Universe movie are your cup of tea you probably have no problem finding something to watch anyway and can pass on "The List".