> I’m facing the very real possibility of moving back home to an unstable and abusive environment while continuing to job hunt
You don't have to do this. You can do anything you want you're a free person with your own agency and plenty of skills. There are a million ways you can work around this.
> What helped you push through when it felt like the system failed you?
Realizing that I am owed nothing, and focusing on ways to get what I want. With your background and skills I am certain you can achieve anything you set your mind to as long as you don't put yourself in a subordinate, dependent, position.