Lumbar stenosis & radiculopathy disability. How do I proceed?

I have had lumbar stenosis and herniated discs for quite a while, I am 60. I work as an aircraft painter, our long term disability is through Lincoln Financial. I have worked here since 2010 with 2 times leaving for a year each time. I had a laminectomy in 2016 L4L5 , it was failed back surgery. I have radiculopathy in my legs with my left side excruciating pain. My second surgery(Jan 2026) was a microdiscectomy that has seemed to fix the right side pain. I still have neuropathy in both feet with the majority of my right foot numb all day and night. Painting aircrafts is very labor intensive, a lot of bending, crouching, standing reaching, climbing etc. I can not stand for any length of time and climbing ladders is tough enough because it hurts but with numb feet I feel like I am going to fall. I am 100 % P&T disabled from the USAF. I am trying my best to keep working as I need the income but it has become very difficult. I have many doctors appointments and miss quite a bit of work from pain. I don't know how to proceed. How to file long term with them, long term SSDI. Your help would be appreciated. I live in Alabama.