I've been cocsa'd at a young age,, however so much was going on at the time it happened that I didn't even realise it was such a bad thing until a while ago. so my view might be different
sa, rape,, both are pretty much unforgettable… no matter how hard you try to forget it'll always lurk at the back of your mind
coping with it is pretty limited,, trying to forget about it or distract yourself are two options,, venting/speaking out kinda helps with it too. putting out all of your feelings into something like art or writing is also a way to cope… and I suppose that alcohol/substance usage would help too, although those may come with consequences.
I honestly suggest just speaking to someone about it. it doesn't have to be a therapist,, maybe just someone who you trust… you could also use chat bots if you're alone (c.ai as an example),, it may not make you forget, but at least you'd feel slightly lighter.
I've used a mixture of all the above to try and cope with both cocsa and other traumas,, it does help