I had something similar happen with Google a few years ago. Even though I had my password and access to my email they decided I was trying to hack my own account and locked me out. Like you I immediately started to look for other solutions.

Syncthing file sharing is really easy to install and use. There are no ports to configure on your router and everything is encrypted in transit. I have my phone’s DCIM directory set up to sync to my home server and PC so new photos are backed up and available everywhere in a few seconds. I installed Syncthing intending to move to another solution eventually, but it works so well (aside from one or two files that occasionally don’t sync) that I’ve just stuck with it.

For passwords Keepass & KeepassXC work really well on just about every platform. I share the password file to every platform using Syncthing and in years of doing this I’ve never had a problem that I didn’t cause myself and those were minor.

You can get both of these up and running with very little effort and quickly limit your reliance on Google, then move to other solutions if you find they’d work better for you.