I definitely lean this way too, though I've become better able to step away from that mindset in games I want to enjoy without it.

I think part of what has helped for me is, having an awareness of that tendency, I now try to actively feed or restrict it.

IE, I play a lot of games where that is the intended fun experience. Stuff like Magnum Opus (or any Zachtronic's title), Slay the Spire (or other roguelikes), Overwatch (or other competitive games) are all designed from the ground up for the fun to be in playing the game at the highest level of execution possible (some more mechanically others more intellectually.) I try to make sure I'm playing something like that if I feel like I'm at all likely to want to scratch that optimisation itch with that gaming session.

Otherwise, when playing games where that isn't really the point, I find it easier to engage with the intended experience knowing that if I want to do the optimisation thing I could switch to something that is much more satisfying for that, but I also try to optimise how well I do the thing the game wants. If it's a roleplaying game, I might try to challenge myself to most perfectly do as the character would actually do, rather than what I might do, or what the mechanics of the game might incentivise me to do. Often that can actually lead to more challenging gameplay too as you are restricting yourself to making the less mechanically optimal choices because you've challenged yourself to only do so where it aligns with the character.