You are way too late. If you want to 'cut' weight do it through a proper diet from about 10 weeks before. If you are cutting more than 2.5kg (5 lb) for a same day weigh-in comp then you are going to harm your performance.
If you were a blackbelt going into the ADCC then or - at a push - a purple belt entering into a big, highly competitive competition then it MIGHT make sense (if you've found your technique has been stuffed by bigger guys), but your first comp, when injured, in a local comp? NO!
It is sad that the MMA / Wrestling culture means this question is a regular one.
Go in there and do your best - good luck!
Note: I speak from experience having cut from 70kg to 58kg for MMA/Thai Boxing a number of times and hating life whilst doing it... I fought at 62.5kg, 65kg, 67.5kg, 70kg. I walk around about 72kg these days and compete in Jiu Jitsu at under 73kg and MMA at under 72kg.