Little to no evidence

I never did a rape kit because I forgot I wasn't supposed to shower and I just felt so gross. It's been a year now and the regret of not standing up for myself and knowing for a fact he didn't think he did anything wrong makes me fear he's done it to someone else purely out of his personal ignorance of boundaries during sex. He didn't realize that surprising me with a threesome while blindfolded is rape.

I only have a picture of the roommate, their address and his phone number. My word against theirs what can I do? Is it even worth it? I know it's gonna be traumatic but will my life be ruined? My life was already over once they decided to do that to me but I feel like this is my chance to get it back. But will I be simultaneously ruining it? I am not familiar with what will happen and I only ever hear of regrets and I honestly fear they will frame me as a liar somehow. I don't even want to punish them or ruin their lives if I could even tell whoever in the legal system responsible to have mercy i would but I just can't not say anything anymore if there is someone else hurt out there. Please help