Skills training is the A number 1 priority for combat sports. After that is sport specific fitness that is gained from things like sparring and drilling. With only two days a week of sport specific work, your priority should be getting more time in working on your art. Also, if you want to get into mma, you're going to want to incorporate some other arts into your training. TKD works well when paired with other standup arts, like Muay Thai, boxing and karate, but isn't great on its own as sparring is done in a different style than what you'll encounter in an mma bout. Not to mention you'll want to work on your grappling and ground game. Your next priority should be to try and find other gyms where you can learn other aspects of your game. Even if you can't afford that, finding some guys from other arts to spar with will help you enourmously. I remember when I was in I think my sophomore year in highschool, a buddy of mine from my boxing gym and I would bring our gloves and gear to school. At lunch the PE teacher would let us go in gym, and we would do some light sparring and drilling together. This helped my skills and development hugely. Just sparring with other styles will help you a ton, as it will teach you which techniques will transfer over into mma and which won't. It will also help you lay a base down so when you do start training in other arts, you'll know what to expect from sparring with guys of that discipline. Once you are getting maybe 4-5 sessions of martial arts specific training with in a week, then you should start looking into bringing in some basic strength and power work. Also keep up your conditioning work, you can never have too much cardio. Hopefully this helps, best of luck and happy training.