I use a variety of Linux distributions on all my computers. Linux is a great operating system that meets my needs extremely well. I would highly recommend using Gentoo, Artix and Arch. My personal favourite is Gentoo because of the ludicrous amount of customisation that you can do on your system.
I run GrapheneOS on my Pixel. I honestly think GrapheneOS is the best mobile operating system. I would highly recommend you use it.
Generally, I do not use proprietary software, however I do make exceptions to still be somewhat adaptable to the world.