L4-5, s1 herniation, numbness down left leg for two years. Have tried pt, massage, epidural injections and oral steroids. What else should I try?

You might . Consider seeing a neurosurgeon and discussing surgical options.
see below. The conservative measures seem to have failed. Now, you may consider if surgery is a potential, but get at least two opinions, one orthopedic, other neurosurgeon, and also consider approaches, such a use of scope, as contrasted to open procedure. Would be rather skeptical of any fusion suggestion, as this may lead to arthritic changes above and below.