Honestly Steam and Proton have solved like 90% or more of this issue, i was in this spot in the past for a long, long time, but Steam has made this work almost seamlessly for a great number of games
And then i got the Steam Deck and this went into overdrive
At this point i feel like Linux is a realistic option for a gamer, qualified of course (anti-cheat tech tends to break things, plus there's a few problematic ones), but we are at the point where you can buy an AAA title and be relatively confident it will run on Linux (check first though)
This is by no means a vital service, but Imgur. Not the image hosting part itself, although the multiple self-hosted alternatives available are mostly aimed at photographs and surprisingly very few if any to memes and reactions for chats, forums and social media. On the other hand, the particular use case of sharing memes and meme dumps is not being fulfilled by anything else at the moment. Go to Imgur even on it's current sorry decayed state and at any time you'll find multiple people sharing image galleries, usually of up to 50 memes at a time, sometimes more. Lemmy, Mastodon and Discord servers try to fill that gap but right now they can't.