Hellow hikinrock and welcome to PC!
You ask a very interesting and pertenient question that I wish had an easy answer like take 2 asprin and call me in the morning.
Those of us who have these issues really struggle with it. Other people must think of us as lazy, at least that is what I feel like. Though I know it isn't the case for me. Lack of motivation is the hardest when I'm in my funk. One thing that has helped me is to start doing something that I really enjoy. Then that spreads over other things in my life.
I'm pulling for all of us with this issue. Keep coming back, PC is great.