A year ago I would have suggested getting a Pixel phone and installing GrapheneOS, but it looks like Google is moving to kill off alternative OSes on Pixels, so not sure what’s the best bet at this point.
I think it’s still the best bet to get GrapheneOS, they said they will continue with their project. As long as it’s working I will most likely use that. With Google bashing against Alternative OS’es and companies relying on stuff like Play Integrity it might get harder to run things but I will use FOSS as often as possible. Most of my apps are from F-Droid anyway.
I always apply a fine layer of oil on the fretboard, let it sit for a few minutes and then clean it. Most people use lemon oil, you can use ballistol oil (I do) but don’t use olive oil. If you have a maple neck no need to oil it.