If your trainer is too boring, get a low wing trainer. My second plane was a SIG 4 star .40 with a 4 stroke, very nice to fly and predictable, I had lots of fun with this and learned a lot with this plane. Until some day a tree ate it.
You should definitely get something different if you are ready for it. The high wing trainer is designed to fly straight and level, do shallow turns. Flying inverted is rather awkward.