I really enjoy Linux Mint and it is what I have been using for a while. Maybe give that a try if you have not already? If you want something with more up to date features and packages, maybe try Fedora. I have not really used it personally, but I am thinking of giving it a spin on one of my machines and seeing if I like it.
That is an old phone! Makes me wish my OnePlus One did not break. I miss that phone, I would probably still be using it if it hadn’t.