Son Was Assaulted On School Campus By Another Peer

Location: Texas NSFW in case due to subject matter, this involves minors, pre-k specifically.

My son was sexually assaulted by another peer in the cafeteria bathroom. This incident was not reported to us despite my son reporting the incident to staff, my son notified us when he was picked up. We contacted the school about the incident, the school did not report the incident to either PD or CPS, We made a formal report with PD they conducted a forensic interview with my child then referred it CPS. The school refuses to take any accountability for the incident as it could've been prevented; there was a prior incident with the same peer encouraging my son to expose himself to which I had asked to have them separated and my child moved. My son is now in therapy and seeing a psychiatrist as he is bedweting and has a fear of the restroom, they refused to move my child from the class due to ratio, implemented a safety plan which is not being followed as the other peer still comes into contact with my child. This peer also had a safety plan in place specifically for the restroom that was not properly implemented during that time. Someone from the school also filed a report with CPS claiming I was medically neglecting my child, I assume in retaliation due to me pushing the issue, not quite sure why that was done as it was easily refuted.

What actions if there are any can I take? I know in Texas schools have sovereign immunity so I'm not sure If I have any recourse at all?