If you need the online storage (or whatever self hosted service) just for yourself (and maybe some few people), it's very simple to set up a Wireguard instance. My server doesn't even show open ports to the outside world, but with Wireguard I can access my git, wiki, etc in my home LAN.
I haven't really tried any of the second tier Solutions like Tailscale. But when you have more users or a more complex environment, that could help.

Still, sharing stuff with "outsiders" would still be tricky, I guess - at least I haven't found a solution...