Focus on completing your degree. You've only got until 35 to apply to OTS. Six years may seem like a lot of time, but you start cross training, PCSing, etc. and it will go by in the blink of an eye and you'll be SOL. Get that done, get involved with the Rising 4 or whatever other professional org your base has. Get into AFSA, go to the meetings, get involved. Go to ALS graduations, dining ins/outs, etc. The publicity will help you a lot when it comes time to submit your application.
Also, start your application package now. Get familiar with the form. Write out your "pick me" letter. Have it reviewed by officers, not just in your chain of command. If you can find a few officers from other career fields at your base that will review it for you, do it. Get your recommendation letters written and reviewed. Yes, chances are you'll have to write them yourself. Don't even bother having enlisted review it. The style of writing is different and it's going to be officers that decide whether or not to approve your package. Don't worry about doing anything with it that requires payment just yet. That stuff can wait until it's closer to time to actually submit it.
You do all that work and then the AF cancels the OTS board because the AF has too many Academy and ROTC grads. Don't give up, just wait until the next board, continously tweak and update your package, submit it then. Or you get lucky and there's a shortage of officers even with all of the Academy and ROTC grads and 100% of OTS applicants get accepted. Then you just did all of that work when you could have just drawn on the form with a crayon and still gotten in. First scenario is a lot more likely than the second one but it has happened. Better to make yourself as competitive as possible rather than leave everything to luck.