I did pretty much exactly this on a Galaxy S1 (i9000) that was old even when I got it, but my uncle who gave it to me said that to make it usable I needed to install Cyanogenmod.
I thought I fully bricked the phone trying and it actually sat dormant for years afterwards until I re-found the Odin backups I had taken, and was able to fully fix and restore it. Unfortunately by that time, nearly no ROM existed that was both up to date and a usable speed.
I moved from Manjaro to EndeavourOS and was been pretty happy with that. Unfortunately my study mandates things like .docx files, Visio drawings, things that just are more clunky to do if I'm trying to do it under Linux, so I've been actually using Windows 10 on my daily driver.
However I have LMDE on a second machine which I have been pretty happy with, although I am more of an Xfce guy than Cinnamon.