1.  If you've got extra cash, I'd upgrade your arena.  Especially because you're in Malaysia Div. 1.  
2.  Since you're already selling out your arena, your best time to upgrade was probably 2 weeks ago...but now is probably good too.
3.  I would build 5-10 VIP Lounge seats and just start upgrading the other seat types until they stop selling out.  You might want to raise prices in the interim.
Most Division 1 teams can easily support 10,000 seat arena, so I think you just need to start expanding.
Steve
Go Bruins!