Slashline: I don't know how I got here, but I do know that WGT will not f$^king tell me that info
Just guessing....
Do you play a lot of H2H, and win? That would move you up a tier.
Are you still using old clubs? With your new level, you are now back to longer tees and (now) need new clubs. Yes, you can keep your old clubs, but you won't win as many games.
WGT doesn't tell anyone anything.