You can upgrade your max tp in the dojo once you progressed far enough in the story, which you probaly have already.
There is a secret place in the desert. You may come across the unusable stone monument. A certain form can use them.
But first you need to find and repair the broken key fragments. The golden jade can be used there for unlocking a additional tf form. The hint shop also sells hint on the location of the key fragments if you should still be missing them.