That would suck if so since I obviously utilize it heavily but this doesn’t seem to be the case? Latest release was just a month ago and their github repo is active.

Jellyfin/Plex like many have mentioned.

I personally like Syncthing for petty much everything else. For general file syncing of course. But also with Joplin pointed to a synced directory for notes. With keepass as a password vault. With synced config directories for some apps across devices like newsboat for RSS, and neomutt for email. I also used to use it with rtorrent via a watch directory, though I currently am using a seedbox for that purpose.

VPN (openvpn/wireguard) is a good idea if you want to access your services outside your local network, without exposing them all globally.

I use rsync for this purpose and the only notable bottleneck is my download speed, fwiw.

I use mailfence. They offer imap, caldav, and carddav. It’ll check all those boxes, but I don’t think those are unique offerings among the privacy respecting email services.

I use Proton Mail’s Proton Calendar app for my calendar though. I was using caldav + davx5 but I had issues with reminder settings getting lost on recurring events.

My suggestion just changes your threat model, so may not be a good one based on your wants.

Perhaps consolidate systems? Managing less devices = less points of failure. But adds the risk of any given failure being more severe.