You can post a thread
here to report a player. Please make sure to use the correct format and provide evidence as it's easier on the staff members.
I don't know much about the Skywars restart, sorry. But I believe you can give gems to players by doing /gems pay (player) (amount). However, that feature is disabled on some servers. I'm not entirely sure if it is or not on Skywars.
Also, Purple4me reads the staff applications.