IS THERE ANYTHING A BILOGICAL FATHER CAN DO TO ESTABLISH HIS FATHER RIGHTS IN TEXAS?

I'M in Texas and I am going thru a situation. I'm the biological father of a 5yr old. When the mother became pregnant she told me and when baby was 5 weeks old I met her. I asked for a DNA test and mother got mad and disappeared. A few months (4months) passed and she contacted me again wanting milk for the baby, at that time I asked her again for a DNA test, she got mad and told me she didn't know why she was bothering me because her boyfriend and her had done a DNA test and the baby was his. She would always call me private so I had no ways to communicate with her. She disappeared again, I ran into her on a singles website 4yrs later and after talking she told me she wanted a DNA test because she had a feeling that the baby was mine. We took a DNA test thru a home testing kit. The test came in and it was 99.99% my baby. Everything was going great she would let my daughter spend the weekend with me. Till she started to ask for sexual favors which I refused and from then on she has taken me thru a very stressful roller coaster. At that time I seeked help from the attorney Generals Office, which told me they could not help me because the AOP was signed. The Attorney General opened the case on her boyfriend because he signed the AOP. Feeling lost I seeked a lawyer, everywhere I gone they all told me I couldn't do anything. she finally opened a child support case but they opened it against the person who signed the AOP. They had a day in January to appear for a hearing. He told her he was not going and didn't care if they took all his check. The mother of my daughter disappeared again and I haven't hear from them in 6weeks. The ex-boyfriend is violent and has physically abused my daughters mother numerous of times. they both physically fight with each other. I do not want my daughter to grow up in that kind of living environment. At one point she told me she used drugs just to avoid from having communication with him. My question to you is do you know what a biological father can do in my situation? Thank you in advance for your help.