I have no vast wealth of wisdom, but I try not to lift for at least 4 days before competition. Your body normally takes up to 72 hours to recover from a hard lift.
I also start to go carb heavy the days leading up to the fight. Also about 4 days, though I do this only because it's easier for me to make most of my transitions on the same day instead of changing something every day. Clean, complex carbs, easy on the sugar and refined stuff. This is assuming weight isn't an issue.
I drill like a motherfucker the days leading up to a tournament. Little things start to stand out in my head, things that I know are weaknesses, and I just drill them endlessly. Sometimes 1,000 or more repetitions in a day. It's not too strenuous, but it seems to do wonders for me mentally. Just reinforcing a sense of preparedness that relaxes me.
I forget which quarterback it was, I think Tom Brady. Someone interviewed him and asked what his secret was for not being overly nervous before a game and he responded something like "Why would I be nervous for a test if I have all the answers?"
Sounds simplistic, but I try to take that approach. It's never perfect, but it gives me one less thing to worry about.
And above all, good luck buddy.
14-4 Sig Bets