It's pretty cool that you were able to make a song for an MMA fighter, great job on that. The lyrics sound good and you have quite a few multis in there which make it sound nice. Now for the negative, to be honest, I can't stand the chorus. It's okay for a chorus to be repetitive but if it's going to be, it better sound amazing. The chorus seems to have the same mixing as the verses and doesn't stand out in any way except for the fact that it is repetitive and annoying in my opinion. Also, the quality isn't very good, the voice is too loud compared to the beat, they don't mix together very well. It could be because the MMA fighter gave you the beat but the beat sound really low quality... That would explain why I think the vocals and beat don't mix together very well.
That's my feed, I hope it helps on your next track man