Many facts are unclear -- including when and where the events you describe took place, what exactly you signed to "sign over my rights," and the location and ages of the various parties involved (most importantly you and the child), not to mention why you waited from 2018 to 2020 to inquire about it.
Presuming this is a Nevada matter, you should consult a family law specialist well versed in Termination of Parental Rights and Adoption matters; if the events described did not take place in Nevada, consult an attorney in the relevant state. You can get background information on those legal topics here and here.
Answered on May 13th, 2020 at 10:28 AM