This isn't unique to video games*. It can happen with anything that you spend a ton of time on, and either burn out on or start to develop more refined taste in. I've had it happen with:
novels
board games
movies
people
You start to see patterns, tropes, or just plain get burnt out on something. It's a sign you either need to take a break, or that your tastes have simply become refined enough that you require a higher bar to find something interesting.
I'm in my 40s and definitely don't play games as much as I used to. But there are still times I get sucked in and have a great time. Most recent example: Cosmoteer, a spaceship building game with loads of freedom and creativity. I'm also looking forward to the Factorio DLC and the Dyson Sphere Program combat update.
Edit: case in point that I can still get excited about games: I finally tried Shadows of Doubt and, wow, what an interesting game. It's like a Deus Ex shadowy sneak-around world with detailed voxel simulation.
though the enshittification phenomenon is a real thing, and why people should play more indie games
As someone who has worked for numerous chaotic software companies over the years and had a couple rounds of burnout:
You can try the quiet quitting thing, combined with things like meditation and distancing yourself from outcomes (e.g. stoic thinking around realizing what you control and don’t control). That might keep you going for a while.
But I’ve personally found that ultimately there is no substitute for quitting a toxic job and taking real time off (at least 3 weeks). Your body and mind have experienced trauma and need rest.
Yeah, it’s been in the news 😩 We broke the global average temperature record something like 3 times last week. The graph that accompanies the articles is actually quite scary