A) Set up a wiregard VPN server in your remote instance. Or better, get a VPN provider, the VPS is kinda pointless.
B) Assuming you're using docker as you should to run your home server's service, use gluetun to connect to the VPN and route your docker traffic for the instances through gluetun. This will ensure that you have a dead man switch when/if the VPN goes down.
C) set-up a reverse proxy to access the various instance from the outside if that is something you need.
Here's a fully developed config, you can use a jumping point.