Clojure could be fascinating for you to learn. It is a different type of language from more common industry standards, but it still has a good adoption and is used by many companies. Clojure for the Brave and True is commonly recommended as a starting point. The Land of Lisp is excellent as well.
I’ve been using LineageOS for a couple of years on a Xiaomi Mix 2. I once had a playback error with Deezer (French Spotify competition), which was fixed rather quickly. The team was reactive and had great communication about it. There are regular updates and everything works great. I psyched that my phone now has Android 14 and not 9, which is what Xiaomi left me at…