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My advice is to always go in short steps, proving the ground and getting to know the alternatives. I’d recommend installing f-droid and having fun testing all the free apps you can, removing google stuff one by one, then, after feeling comfortable, trying a custom rom, and when you eventually need a new phone, looking for a model more friendly to degoogling.
I am on linux mint on both my laptop and my desktop. I only need my phone to be degoogled and I will be all set.
My advice is to always go in short steps, proving the ground and getting to know the alternatives. I’d recommend installing f-droid and having fun testing all the free apps you can, removing google stuff one by one, then, after feeling comfortable, trying a custom rom, and when you eventually need a new phone, looking for a model more friendly to degoogling.
Check out the supported device lists of Graphene OS, Postmarket OS and Ubuntu Touch.
As a long time Ubuntu touch supporter and tester, I unfortunately have to say that it simply isn’t ready for a lot of users at the moment :(
Even if you’re willing to put up with most of its shortcomings, VoLTE device support is extremely limited.
But don’t get me wrong, I REALLY want this stuff to be the future, I think it just needs a bit more time.