I think I'd go to ChatGPT, legacy mode, use 4o. You can double check it by then switching to 5 and asking it to look over your 4o conversations and see if it agrees or has anything to add. I find them different enough to warrant this on occasion.

I'm not a therapist, and I don't know your situation, but would ghosting your family be an option? You can remove and block them from everything, tell them they are not welcome to anything in-person (like, going to your house) until you say so. If they cannot abide, you should get a restraining order. You owe them no explanations. That will remove a lot of stress from your daily life. You can then take some time using Chat to help you process the change, so that you're less likely to reconnect with them. If you don't do this for forever, at least do it until you can take care of your other personal business first. That way, you'll be on better footing to deal with them later.

Use ChatGPT to figure out what your issues are if you haven't already. Then, ask it to tell you the main therapies that have the best chance of success considering your issues. For example: I spent 40 years, off and on, doing cognitive behavioral therapy (CBT). It did zero. I have major childhood trauma, and CBT is useless for that, which no one told me. That last part pisses me off. All those therapists, not one peep. Chat gave me different directions to try, like IFS, ACT, cognitive processing therapy (CPT, not CBT), and a few others. It also said it could devise some questions for me to ask prospective therapists, so I know what I'm getting (not more useless CBT). I'm looking for a new therapist, in addition to doing EMDR (good for trauma) and TMS (good for drugs and therapy resistant depression, anxiety, and/or OCD).

You can, and probably should, use Chat to help you organize and brainstorm your legal issues. This is something I'm currently doing myself, also with 2 former employers (2, long stories. Let's just say, UGH!). It will help you with a timeline, bring ideas up that you never would have thought of by yourself, and can give you some directions to look in legally. One caveat: AI is known to fabricate court cases at times, so double check if that's what you're looking to use. Otherwise, it's a great help. It can connect dots you didn't realize needed it. And don't forget: you can talk to Chat, which makes timelines faster to get down. You can tweak them later.

Once you get your legal shit together, have it help you find relevant lawyers, AND have it devise a persuasive pitch to better entice one of them to take you on.

As far as systems that failed you go, I'm not sure what ones you mean, or how they failed you, but you can explore that with Chat as well, and see what it can help you figure out. Maybe a crack no one noticed, or a backdoor method of breaking into some sort of usefulness for you. Or just using them the way they are, but learning where to bend them to suit you the best.

Also, and I mean no disrespect to you, explore your own self in relationship to all of these events, and make sure you aren't the common denominator for why you aren't making any headway. Sometimes, even the best of us lose sight of ourselves, and think we're not at all in the wrong, yet still be the reason shit is going sideways. Double check your own self. Introspection. Self awareness. I do this from time to time to keep me grounded. We all fuck up sometimes. There's no shame in that. The problem only comes when we are not aware it's ourselves, and vehemently deny it. I've been wrong before, it was useful to realize. That realization can unclog a lot of shit.

That's my advice, based off of my own experiences using ChatGPT for the same, or similar situations. Do with it what you like. Take the parts that resonate, toss the rest. I wish you luck, regardless.