android 10 (seems to me some kind of kernel problem) for our phone is ****ed up, battery wise.
just stay on a9, tweak it a bit and you should have better experience than with a10.
sure, some have good battery life on a10. i was one of those people. but over time it just started declining. it could be because i used custom kernel and some heavy tweaks from that one thread here.
actually, i think that the more you tweak this phone, the worse battery life gets. sure, you can disable few apps, but that's it. don't go crazy on disabling services and what not. maybe install custom kernel.