Playing via VPN: what to do?

[Kanser]

Somehow, about a month ago my internet provider has blocked the IP of the RoR server. No idea why and I cannot even ask him as I don't know exactly which IP was blocked.
Have to play via VPN now. Recently playing via VPN became impossible as well: huge lags no matter which VPN service I used (have tried few of them). Any tip on what can be done? Perhaps asking the game dev team to change the IP of the server is too much, but maybe someone knows a VPN which will work?

[Bankei]

You should first confirm if IPs were actually blocked. Are you able to reach the login server with VPN?

You can find the exact IPs you're trying to reach, here are the steps:
Open the RoR Launcher and hit "Connect" (even if it hangs).
While it’s trying to connect, open the Resource Monitor from your start menu.
In Resource Monitor, go to the Network tab.
Look under TCP Connections. Look for WAR.exe or RoRLauncher.exe.
In the Remote Address column, you will see the exact IP address the game is attempting to reach.

Now that you have the IP for RoRlauncher.exe and WAR.exe, hit CTRL + R and type "cmd". In the command prompt, type "ping [INSERT IP OF SERVERS]" and see if you can reach either or both.

[Kanser]

it does connect via VPN, though the lags are unbearable.

I will try to follow your steps being without VPN active