Oh, I get burnt out all the time! I get really invested in a game, I play it every chance I get, I watch or read stuff about it when I can't, and I'll think about it all the time. This can last anywhere from a couple of days to a week or 2. But then I'll feel my interest slowly drain until nothing sounds worse than playing whatever game I was interested in. It's just the kind of person I am and despite attempts to change it, I've resigned myself to it. I've figured out some stuff that makes the burnout easier though.
1. Don't reset. I'm a chronic re-setter. I think my perfectionism tends to bleed over into my hobbies, so when I inevitably return to a game I feel like I need to reset and that
this playthrough will be the one I'll complete the game with...I haven't completed a lot of games because of this, and, probably worse of all, it makes playing through the beginning of a game a slog because you've already done it a bunch of times but you still haven't seen the stuff that happens later. Now if I really need to, I keep a couple of notes on my phone about any builds or stuff I was working on so when I do get the urge to jump in again I can jog my memory and pick up where I left off.
2. Play different games. Don't be like me and start a playthrough of Breath of the Wild after playing through Horizon Zero Dawn and definitely don't start a new Skyrim playthrough after that. Speaking from experience.

Mixing it up has helped a lot in keeping my interest in games alive. I'm playing through Fallout 76 right now which scratches my "questing and destroying bad guys" itch and then when I get sick of that and I feel like building something I switch over to DragonQuest Builders 2. Both games are different enough that when I get burnt out on one I'm normally excited to play another. And when you're not constantly resetting save files (RIP all of my different saves over the years

gone but never forgotten) you can actually make progress in your games.