Based on you even asking this question and thinking your suspension is already amazing its far more than good enough for your needs. Its got Showa big piston forks which are excellent, not sure what the rear is but its likely a Showa as well. Best thing to do is have your stock suspension set up to your weight by a reputable shop, it should only be $100 or so.
As far as how good it can be, you can spend the same amount of money as the bike when it was brand new if you really wanted, would YOU get your money's worth out of it, hell no. Would you even notice a difference...maybe, it all depends on your riding style.