Be sure to enable the "optimized charging", when it decides that you're mostly running plugged in then it'll hold the battery at 80% to avoid holding it at 100% forever.
There is an application called "AlDente" that lets you control this more precisely - not only can you essentially force it to hold at a specific charge level at any time, but you can also configure battery temperature limits (battery won't charge above, eg, 35C) and also "sailing mode" which gives it some hysteresis so it won't immediately charge up to 80% (or whatever you set) but rather stay at (eg) 76% if you run unplugged for a few minutes.
There is an application called "AlDente" that lets you control this more precisely - not only can you essentially force it to hold at a specific charge level at any time, but you can also configure battery temperature limits (battery won't charge above, eg, 35C) and also "sailing mode" which gives it some hysteresis so it won't immediately charge up to 80% (or whatever you set) but rather stay at (eg) 76% if you run unplugged for a few minutes.