Ever so many wanting to get rid of google spyware ("stock Android")... Start by searching for your device, what OS, IF which supports, has official ROMs for. See/Search for UNOFFICIAL builds (ROMs) for your device SPECIFICALLY. Beware of "minor" phone/model differences could be fatal ("Bricking up") your device, if incorrect ROM installed. Prior to any of it, make sure, you can unlock BootLoader. It's great, if you can lock back BootLoader after install of any FOSS OS (or Alternative OS, as some are paid after-all) after. List of non google or "de'googled" OSes: CalyX_OS: calyxos.org/ /e/OS: e.foundation/ iode_OS: iode.tech/ CrDroid_OS: crdroid.net/ Graphene_OS (pixel ONLY): grapheneos.org/ Lineage_OS: lineageos.org/ Ubuntu_Touch_OS: devices.ubuntu-touch.io/ Jolla_Phones: jolla.com/ More or less proprietary (+ few Sony Xperia models "semi"-supported) SailFish_OS: sailfishos.org/ Mobian_OS: mobian-project.org/ mobian.org/ PostMarket_OS: postmarketos.org/ DroiDian Project: halium.org/ Feel free to extend the list or recompile it or do whatever you want with it, it merely is a "guidance" as where to look for the info.