Generally, no, it isn’t possible to fix a hernia without surgery.
Using a hernia belt or truss can keep the hernia in place, though, which will provide relief can help you endure it until the day of your surgery arrives.
That’s all a hernia belt is designed to do though: ease any pain or discomfort you feel as a result of the hernia. It isn’t meant to be a replacement for surgery, and wearing a belt alone can’t fix a hernia.