Need JUSTICE !!

There’s a one fk er under fake instagram account, dming girls across town disgusting things, like very disgusting, some of them reported him to the police but ofc they did nothing, so i thought about grabify link ( i know that i couldn’t go through because i’ll get only provider adress but i know guy from the provider company he will probably help out) is there anything more ‘clever’ to do anything for gettin his identity or adress somehow? because im noob in this , don’t think im idiot don’t message me any service i won’t pay just looking for advices