23m s/p l5-s1 discectomy w/ daily moderate-severe back pain & radiculopathy both leg. what is my next treatment option? more epidural? fusion surgery?

Find out why: You shold go to see your doctor/spinal surgeon to find out why. Is there any new bulging, new tear, etc that requiring any surgical approach or is something that can be treated supportively. Something you will find from further testing. Definitely, you should have an MRI of ls done to evaluate this problem. You won;t know the treatment if you don't know the cause of the problem.

Second opinions: Are often required to provide clarity and support for, or reevaluations of, earlier recommendations. This is a complex question requiring a deeper conversation between patient and provider. Fusion may be indicated but not feasible for some, epidural may be untimely or even contraindicated for others. Face to face is best here.

Failed back: It appears that you have failed back syndrome. Please see a pain specialist for evaluation and treatment. You might benefit from additional therapy, medications, injections like epidural steroid injection or spinal cord stimulation.