I think openvpn works completely fine for most use cases and didn't have any trouble with it at all. I did however switch to wireguard on my gateway and I get a little better throughput compared to openvpn. That being said, I'm also using a pfsense box as my home gateway, so access to internal services has been easy as general routing gets.
I like proxmox, but it kinda sounds like you'd be just fine with just docker running on opensuse or debian. Or whichever the favorite container is these days (idk why podman is so great, but I seent some posts about people that love it.)
I have tiered out my server with all my app services (jellyfin, nextcloud, etc) running in docker on a debian vm, then have lxc containers for nfs, VPN, etc. Proxmox itself handles ZFS, but I'm sure that's bad practice and there is probably a better way - but it works for me so 🤷.
I've also got a opnsense vm, but not used for any "production" atm; just checking it out to see if I should switch my pfsense box over.
If it's any consolation, I haven't used Google in years and I still haven't heard of this site.