I use KeepassXC on desktop, KeepassDX on my phone and keep it all synced with Syncthing. Works great
I have been using Graphene for about 5 years, first on a 4a which was great and now on a 6a which is a bit crap tbh. The software is solid; it's the harware which is lacking. Much as I love Graphene, I'm having serious doubts about upgrading to a newer Pixel when this one becomes EOL. My partner has a 6 on stock software and she complains about that too. On another note I recently installed e/OS on an old Samsung S7 Edge and I'm really happy with it. It's given a pretty old phone a new lease of life, increased the battery life etc. You can check if your phone is compatible here
Have a look at E/OS. I rooted an old Samsung S7 Edge recently. They have an Easy Installer app which said it supported my phone; however, I couldn't get to work so did a manual install instead.
I've been on this privacy trip for about 6 years now and every once in a while I find myself on the point of giving up, usually when trying to do things like booking a flight and the site fights back by blocking everything or wants all your personal details... every app I am forced to close, or mothers maiden name I am forced to supply, causes more and more frustration. I rage, my partner says 'why do you put yourself through this?'..... I really don't know sometimes, but basically because fuck 'em