I have tried to set up most of the options and I ended up on Filebrowser Quantum.

Simple to set up and use. I recommend giving it a try.

https://eylenburg.github.io/android_comparison.htm

This is a great table of comparisons between the different Android alternatives.

While Obsidian is undoubtably a good piece of software

Don’t promote proprietary software!

Self host filebrowser quantum! Small, light and easy to configure.

It is currently in beta, but it is on the cusp of a stable release.

PostmarketOS has piqued my interest as the most promising Linux phone OS, if you can put up with an immature system, at least when compared to Android.

Check out obtainium:

https://github.com/ImranR98/Obtainium

It get updates straight from the source.

Need a source on this one, I want to read up on this.