[Gianluca Roncaglia]

Thanks for the reply guys! Sometimes it doesn't let me join Server 1, is there a reason for it?

If there are more racers than the capability of server 1, they are split on server 2 (and 3 and 4 if necessary). In order to access to server 1 you have to improve either your general or your specific championship rating. The cleaner you race and the better you place, the sooner you will access directly to server 1 in all circumstances.

See also the Regulation page here:

https://www.simracingsystem.com/regulation.php