Long time LG OLED user here (B6P); here are the lessons I learned the hard way:
1: For the love of god, TURN DOWN THE OLED BACKLIGHT! This is without exception the easiest thing you can do to extend the life of the panel. I ran mine at 100 for a year, and that resulted in my windows taskbar (which I hadn't set to auto-minimize) to permanently burn in. I've been running on 30 [believe it or not, you adjust faster then you think] for four years since then, with only very minor panel damage despite using the set for several hours a day every day for four years (and most of the damage since then can be attributed to almost two years of WFH, which is OLED's "worst case" usage).
[Note: The B6P was before LG put in a lot of extra anti-burn-in tech into their panels. I can't personally speak to those, though I have seen people over at avsforum claim to have used B7P's as PC displays since launch with no sign of burn-in.
Also note despite playing a ton of strategy games, I've never had a problem with any overlays burning in, especially since I turned down the OLED light.]
2: All black screensaver with just a few minutes turn-on will help extend lifetime a bit; same with a short (15-30 minutes) turn off time. [Granted, most OLED TVs have a built-in screensaver that should fire, but better safe then sorry].
I will say OLEDs are awesome at both displaying images and for being insanely fast for gaming purposes, but they "do" require a bit more care then most PC users are used to. But based on my B6P usage, with moderate care you should be able to get a good 5+ years out of an OLED panel if cared for. Hopefully, MicroLEDs will be a thing by then and you'll have the best of both worlds.