If it's possible and you haven't yet, moving out would probably help.
If you've already moved out and it hasn't helped, or if you can't move out, spend as much time with people you like as possible. It helps a lot when you find "your people," and yes I am aware of how stupid and cliche that sounds but it helps so much. I've got a little circle of teammates and coaches now who I actually trust and it's really great to finally have people to rely on. It doesn't have to be many people and it can be one person, but find someone you trust and care about who cares about you too. It's weird and hard and awkward but it's so worth it because you'll know you have someone who can help you and you don't have to do everything alone.
Therapy is kind of hit or miss. I can't afford it so I've never gone but I have friends who went to therapy and from what they've said, it only really helps if you have a good therapist. Some of them have had really good experiences and therapy really helped, and some of them hate their therapists. Basically what I mean is that if it hasn't worked for you the first time, it could be worth giving it another try. Look for other therapists and read reviews so you can make a better decision. It might take a few tries before you find one you really like who actually helps, so just give it a chance. I'm not sure how therapy normally works but it's probably less about your therapist understanding what you went through and more about them listening and helping you process it.