Can I advise Cigna to sop making payments if I intend to return to work?

15 years ago I signed up for STD and LTD benefits that was part of a benefit package through the employer. I paid for this insurance on my own every paycheck premiums were taken out, never thinking I would ever have to use it. Thought was a great safety net in case I should ever have to use it. Yeah, some safety net with a giant hole! Was receiving STD. Can’t work 7 1/2 to 8 hours driving any longer. Not sure what type of employment I can do and make the income I had driving? If I no longer want STD, can I inform Cigna to stop STD benefits so I can apply for other employment? Dealing with Cigna isn’t worth losing my mind or quality of life, it seems Cigna is bent on ruining the lives of people who genuinely need this coverage. It makes me sick to think that many people have paid for this insurance out of their own pockets. And when it is truly needed only to be denied. Why is it, they seem to be above and beyond what’s legal? I’m not sure what other employment I can do, but at this point I will try anything.