A book that I very much enjoyed and could help you a lot is "Photographic Assignments" by Michael Busselle. It may be hard to find because it was printed in 1992 and reprinted in 1994. You can use it almost like a text book to give yourself all types of photographic assignments, as demonstrated in the book, and then carry them out. This will help get you in touch with what you like, photographically speaking, and probably make you a much better photographer in the process.
I would caution against buying any new equipment just yet. Camera are expensive and without knowing where you are headed, you chance of bad investments is high. But more important, the camera does not matter until you find it is the limiting factor in the direction you want to go. For example, suppose you end up liking street photography. It is very possible that the camera you have would be ideal, or perhaps a digital P&S.
Use the web, starting with this massive site, to learn and experiment.
Good luck!