Hehe... I went to check your profile, to see what equipment you are using, what your stats look like, to see if I could answer your question. However, it looks like you have answered it sufficiently with your play. Congrats on the 28. I'd say that's a resounding YES, you can play at the higher tiers, but I will warn you as you move up, you are gonna need new stuff. It's gonna get harder and longer.