I feel you, Neenee. It sounds like perhaps you are where I started. I was always a low energy person due to untreated hypothyroid, Even after my thyroid issues were resolved, my habits were very sedentary. I eventually overcame them, and became quite active as a walker...until a few years ago when knee injuries and then lockdown interrupted my walking routines. Now I am struggling to get them back.
Things I find helpful:
1) a goal. My original walking routine started because I worked 1 mile from Michaels, two miles from Hobby Lobby, and three miles from Joanne's. (Obviously, I am a crafter!) We had one car, so my husband was picking me up from work anyway - so I had him pick me up in front of the store instead in front of the office. The faster I walked, the more time I had to shop! As I got more fit, I shot for a further away shop at least a couple of times per week. That got me out the door. Eventually, I got fit enough that I was walking just because I enjoyed it, and I would walk to places around the neighbourhood that I would previously have driven to.
2) a pleasant place to walk. After a while, I started driving to parks with woods to walk with a friend and our children. Being out in the woods was its own reward for me!
3) routines When we moved to Australia, I explored every place on foot and since we don't have a car here, every errand involves a walk.
My challenge now? I am living in a suburban neighborhood with no attractive shops to draw me out and no beautiful wilderness to walk in. I have found a nearby walking track and am working on getting my fitness back by walking in big circles as fast as I can for 45 minutes at a time. It's harder than when the walk had other more intrinsic rewards, but I remember the sense of physical well-being fitness provided, so I am hanging on to that. I am also tracking my fitness in my blog and in my diabetes journal, to keep myself accountable...and it also keeps my spirits up when I eel like I am making no progress, to see that I at least am more able than I was a month ago!
Good luck finding your own motivations!