If you want to practice your ATC skills in the training server and you would like to join /already in IFATC recruiting process, I suggest you to open an ATC tracking thread. There you can open airports (I suggest little ones with less traffic and try to avoid busy TS hubs like EGLL, KLAX, KJFK, OMDB, etc…) and experienced people from the IFC will come and provide feedback on your ATC skills is you can improve step by step. Perhaps also IFATC members. Down below there’s the link to “how to create an ATC tracking thread”:
I hope everything is clear and if you have any further questions don’t esitate to ask in PM!