Good to heart the knot is reducing in size.
Are you working up/downstream of where you see the issue?
Where you see the issue isn’t always where it originates. Working up/downstream can help the knot start to release.
Are you addressing your back?
Did your chiropractor  recommend anything to do?
Have you changed your sleeping position to take out that impacting factor?
Did the massage therapist have any recommendations?

As some aspects resolve symptoms can move until the cause of the situation is addressed.
As one things is resolved other come to the surface.