Is it possible that you will open me UDP port 27015?
Why do you need this?
Port 27015 (usually UDP, but also TCP sometimes) is used for Steam games, most commonly multiplayer games. You won’t be able to host a multiplayer game on this platform, for that you would need a VPS at least, and I’m not even sure that will work. Steam servers are customized and although you can run some servers locally, not all work that way.
Regardless, this won’t be possible on any shared hosting server.