I used to play with about 800 dpi and 0.8 sens, although i found it pretty nice to play with that sensitivity my mouse didn't.
Since i dont use a gaming mouse its kind of hard when i would try to flick or really move my mouse at high speeds because of the mouse's sensors it would sometimes lag.
Right now im out of the business and have retired so no need to worry
I play LoL from time to time and recently started playing some VALORANT, as for that i still have knowledge but the skills and muscle memory would take some time to build back if i would want to get back.
For now im keeping it casual