2 year post umbilical hernia surgery pain

In July 2021, I had an umbilical hernia surgery. This was done with a stitch, not mesh. Recovery was good, but it always felt tight in the area. Approx five months ago I began experiencing severe pain, swelling, tenderness, & the area was warm to the touch. I went back to the surgeon thinking perhaps the hernia returned, but a CT scan showed that was not the case. He believed it was scar tissue but couldn't help. What can I do to break up this scar tissue?