You need to have all elements of your game in check

Technically sound, mentally strong and physically able.

Your weapon is your technique. Your mental game is the confidence, toughness and intelligence to wield that weapon. Where your strength and conditioning comes in to play is as a tool to keep your weapon sharp and your mind clear throughout the fight.

Here is the thing though its all intertwined or holistic or whatever you want to call it. If you are mentally strong your conditioning is automatically at a higher level and technique comes far quicker and easier then someone who is mentally weak. If your technique is sharp you use far less energy then someone who is sloppy and you have more confidence in what you can do. If your conditioning is good and your body nourished and strong you can put in more hours working technique as well as be in a far better mental space. Everything is holistic and if you focus on your game as a whole instead of individually then improvement happens 10 fold.

Likewise if you are missing an aspect, well its like a tripod, one weak leg and your camera is smashed.

The last and often overlooked element to improving your game is to have a strong support group. Friends, family, training partners, a good coach. This is what fuels and guides you. Not to mention makes the whole process an enjoyable one.