Dealing with past trauma, such as domestic violence. What are some options?

First time asking this after a lifelong of dealing with domestic violence. A friend said to see a therapist, but I’m not sure who to trust. He said you can try BetterHelp or other online services, I have no experience with any of this, and am not even sure what kind of help I need. I have gone to a few DV shelters to volunteer and help out, but they keep you isolated from the survivors and children (presumably for their safety and HIPAA requirements). Thought if I spoke to people in the same shoes that would help. Same for the counselors, it’s difficult to find the right person to talk to. Any advice or suggestions would be greatly appreciated.
Dealing with past trauma, such as domestic violence. What are some options?
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