Hi Laura - I am not a long Covid survivor, but I did have a long illness that drained me, and had to start from close to zero to rehab. I would walk in the house, timing myself. Once I could walk 5 minutes, I ventured out - just to the end of the driveway and back. After a few days, I added a walk around the house, then to the corner, etc... always had my cell phone in hand. Eventually, over the course of a summer, I worked up to 2 miles at a time, and had several routes in my neighborhood to choose from.
Could you try something like that?
Sue