The amazing community of TF2 is unmatched by Overwatch. From nope.avi to DWL1993's various remixes, they were an integral part of internet meme culture of the late 2000's and early 2010's.
TF2 has also accumulated a decent amount of design cruft -- I'm not a fan of the cosmetics added post-release that alter the silhouettes of the classes, plus the alternate weapons dramatically change how some classes play/must be played against.
OWL and OW itself is still going strong albeit “faded” as you’ve stated. But I’d put Rust in that bucket as well PUBG Is circling around the drain as well. Apex is still doing very well ofc.
Escape from Tarkov is the new trending game and the market leaders are still Fortnite CSGO and League.