I'll get links shortly and explain in more detail, [I will also add lots of the problems would have been solved had I taken backups properly]
What I did:
Unlock bootloader, and patch/install a patched boot image and magisk
Install a custom recovery - I used orangefox, I think TWRP is also on Nothing
Make the protected file system read/write
Download a file explorer that has root access available
Go into the root filesystem, and delete all the google stuff you wish to get rid of [You will want to make sure you have a keyboard installed!!]
If you just want to get rid of google apps, you'd be able to stop here.
I did want banking apps available, and they need google services framework - you have MicroG I downloaded from the F-droid store, and then used a magisk module to make it a system app to keep everything happy there.