I've been slowly moving away from Google as well, for the past 3 or 4 years. The only things Google stuffs that I use are Maps (no other gets to even 30% of what Google Maps are. Well, maybe Apple Maps, but I don't have iOS) and the occasional Google Search.
I moved email, contacts and calendar to Mailbox.org, the service that checked most boxes at the time. It was 1 Euro per month (it is still like that for older accounts, but the cheapest plan now is 3, which is not much), is compatible with IMAP, SMTP, CardDAV and CalDAV, which I need. It has a bunch of other stuff like a Drive and Office suite, notes, tasks and some other but I don't use them.
I'm using a shared payed account on Microsoft OneDrive for files, but I'm currently using 2 Raspberry Pis with Syncthing for photo sync and a bunch of folders. I still have to see how resilient my set up is before discarding OneDrive. I need a way to easily access files from my phone (which Syncthing doesn't do unless you *sync*) and a place that I can see photos in a decent manner, a la Google Photos. But this last I will get in time, because there are alternatives.
I also host my own music with Navidrome, a subsonic compatible modern music server, which has proven flawless for the last year or more.
I'm glad I make these choices, that I can do it. I think I discovered my hobby and it's even a useful one :)