If you are having "some" good days that is a good sign. For some, improvement has been slow but genuine over a period of years.
Is the annular tear in a different disk to the operated disc?
Unless only a migrated disc fragment is removed, discectomies purposely create an anular defect that is not repaired by most surgeons and may never heal.
There are emerging methods (link below) for sealing anular defects that you could consider ahead of major surgery.
Biologic disc treatments