there might be an BIOS update you could try i don’t think it will fix 64 bit and even if it did 32bit apps probably take less memory for storing addresses.
on my AOD255E 64bit just works :tm:

apps like https://play.google.com/store/apps/details?id=com.parseus.codecinfo (https://apt.izzysoft.de/fdroid/index/apk/com.parseus.codecinfo) show whether or not you’ve got it, on my samsung galaxy note 20 ultra I’ve got software only :(

you can disable paging (swap) i guess apart from launching more things at the same time and letting apps know you have ram for them to cache shit (check app settings some apps do have a how much ram should we use slider like okular the kde pdf viewer) and virtualisation of multiple os’s i can’t think of much