Alpacalex

If your concern is third-party reliability but you'd still like a password manager, I'd say your best bet would be pass + git. pass uses gpg to encrypt each password separately in a file structure, and works very well with any sort of git repository making it accessible across devices. Depending on how you set it up it can be 100% in your control with minimal configuration (in my case though I've been lazy and just hooked it up to a private GitHub repository).

If you're using a *nix system: https://www.passwordstore.org/ I switched over from LastPass a few months ago. It uses gpg for encryption and supports git for password syncing between systems. Pretty simple to set up and use. There are quite a few third party apps for it already (both desktop and mobile)