I'm no fitness expert but it takes time to build up. In the last few months I have increased my training significantly to 5/6 days and incorporate weights 2 days a week. It's really tough and I feel exhausted some days but it's about eating properly and hydrating. I now take a whey protein shake every day which helps my recovery. My schedule is Mon- kf/mma tues- cardio/weights weds-off thurs-sparring fri- cardio/weights/sparring sat- mma sun- cardio/sparring. Make sure you eat plenty of good stuff. I started upping my schedule without eating enough and I couldn't get out of bed one morning, when I did I fainted, so it's really important.

Think about your goals and train for those.