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If you inadvertently turn off VNC / ARD on your hosted Mac, you can re-enable it through a console connection via SSH (which MacStadium turns on by default on all subscription based Mac servers) with these instructions:

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IMPORTANT!

If your Mac mini is running macOS 10.14 or higher DO NOT run the following commands in the terminal. They will put the OS in view-only mode. If you are accessing the hosted Mac from a local computer running OS X, you can click on Spotlight, and type ‘terminal’. Once in terminal, execute the command: ssh 192.168.1.200, where the number sequence is the IP of your hosted Mac. If you are on a Windows based PC or other local workstation, download a Telnet/SSH client such as PuTTY, and connect to the IP of your hosted Mac. When prompted, enter your administrator-privileged username and password (the account you use to access the remote Mac). Once logged in, you can execute the following command at the prompt to re-enable VNC (where it says mypasswd, insert your desired VNC Password): 
sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart -activate -configure -access -on -clientopts -setvnclegacy -vnclegacy yes -clientopts -setvncpw -vncpw mypasswd -restart -agent -privs -all
You can now close your terminal/SSH window, and attempt to re-connect via your VNC / ARD client as normal.