What Martial art should I choose?

I am an orange belt in Tae kwon do and soon to get my green belt [for the people who don't know that's half way to black] and I was wondering what Martial art should I choose after this one I did some Karate a while back but never made it past a white belt I want to be able to open a martial art dojo when I get older and I'm just wondering what martial art would people pay to be taught I was thinking Judo,jujitsu[srry if misspelled], Muy tai,Kong fu,or Karate