I am the a parent who has lost my custody. I need to know what I need to do to get said child back.
If it is important, hire a lawyer. No one here knows anything about the situation, and you chose to tell us nothing.
Since you chose to tell you how you lost custody, why and whether the order was a parental termination or something less, no one here can even tell IF you have any rights at all. See a lawyer, show him or her the court orders, and ask. No one who has not seen the actual court order can even make an educated guess.