Please help before I loose my kids to an abusive man

I was hoping I can get some help,I just got out of an abusive relationship,I have been at my sister’s house for 2 months now and I need to get out of here because 1,it’s close to my ex 2 they have alot of issues with CPS and I don’t want to lose my kids with there drama if there’s anything that can help please let Me know. He will go for full custody and I have no where else to go. 2021 I left and he bashed all my windows out with my son in the back seat and he put me in jail. I went back because they were going to give him full custody!!!