What I need to do if police don’t press criminal charges ?

I do not know what to do or how to act or where to go specifically when clearly my daughter's father called Neftaly has committed two crimes back on April (kidnapping my daughter to Mexico, and having hired a person called Crhistoper to threaten and rob me, which is currently in jail under robering charges against to me ) The state of texas has not filed any criminal charges against neftalty, and currently he is under INTERPOL search after last week they can’t find him on his residence in Mexico, I have police reports, sentences about my full custody and Mexican court, Neftaly and my daughter are us citizen I am Not, but I don't know why FBI is not involved and I need to know with who I gave to talk or ask the district office attorney ? or the prosecutor ? of each county because each crime happened in a different county in texas? And what I have to said, please I need help we believe he can be hide here in USA I need more help from here