PostmarketOS is a complete degoogled mobile ecosystem, actually. How about we commit resources into that?

Personally I'm pretty happy with GrapheneOS (Android AOSP distribution) and also donating to it. It works for me, its licensed under a free software license, there are plenty of cool free software applications available. I'm familiar with Android application development if I need something custom.

Unless Android (itself, not Google Play Services because I don't depend on them) goes closed source I don't see a reason to switch to something (imo) inferior.

I have nothing PmOS, phosh and other free mobile smartphone projects and will probably redirect my resources towards them if Android goes closed source.