Everyone has given the typical "bro" solution - Gym, MMA, Diet - but that's not the answer .. completely.
Step-1 is to identify the areas you are strongest at and the areas where you are weakest.
Step-2 is to turn those weaknesses into opportunities for growth.
Step-3 is to set a plan for yourself; a personalized goal for each point of weakness you found. Determine what success looks like.
Step-4 is to get after. No excuses.