Strictly answering your quetion, the next step is to get your lien on file. Be careful, as the Texas lien requirements are both very strict and quite complicated. But at the end of the day, if your lien notices and affidavit are ignored, you will need to file suit exercise maximum leverage on the various parties to pay you. Often times the law allows you to recover your attorney's fees, so don't hesitate to reach out to a construction attorney for help.
Very best,
Ben House - 281-762-1377 - ben@houseperron.com