It looks like you've got some pretty good fighters in your camp already. I think if you're interested in getting a belt, it's not too hard to get one in the lower orgs if you just stay picky about only fighting opponents you're sure you can beat. Get near the top of the ranks, and wait until the champ is someone whose styles are easy fights for your guy.
My own personal strategy was to slowly build my team up to having as many recruits as I could have and letting my guys fight as often as I could to build up money for better equipment. Once that got better, I paid more attention my my fighters and split my camp into three types of fighters: ones i'm trying to make into champs, ones I let fight anybody to get a quick buck, and fighters I don't fight and just use as sparring partners to build up individual skills. hope some of that helps!!!
toi tankz