crushin bigger people

I defeated a much bigger guy bigger then me by using my jujitsu skills.He was shocked of seeing a liitle guy out throw grapple him in a submission.I showed him strengh dosent me squat if you dont have groundskills.I need advice im already in jujitsu.I plan on going to ultimate fighting championship should i mix up my skill by learning boxing.Thats a good combination strong punch with submission and ground skills would make a champion.