I'm still not sure what I could migrate to that would give me solid and trustworthy sync/access across Windows, Mac, iOS, and Linux.
I'm happy to pay whatever I pay for Dropbox -- I don't actually remember what it is -- but I'd rather they stop throwing in bullshit kitchen-sink features.
I was in a similar boat and fairly recently started using pCloud, which I've been liking a lot. It has minimal frills and just focuses on file storage and sharing. I mainly use the Linux and web clients, both of which are excellent. I don't have any association with them outside of being a happy customer.
I have zero interest in administering my own services like it appears Nextcloud, even with Hetzner, would require. I've been there and done that, but I'm too far out of the sysadmin game now to do a good job of it. It's a bad use of my time, and not something I enjoy as a hobby.
I'm unwilling to use Google services if I can avoid it.
The service I mentioned (Hetzner, but there are others) do all the administration for you. You get a login and password into a Nextcloud instance, that's it. No administration required.
I can vouch for this. I haven't really done anything on the web interface, I use it for file sync like i used to use Dropbox, and I have clients in Windows, Linux and Android and it just works.
I'm happy to pay whatever I pay for Dropbox -- I don't actually remember what it is -- but I'd rather they stop throwing in bullshit kitchen-sink features.