My* experience: Motivation doesn't come. Waiting for motivation is allowing yourself to be controller by your feelings.
At one point you just decide to do it. Ignore the feeling that you lack motivation. Grind through even one laughably small bit. Then repeat that, every day. Nothing changes, you just do it.
At one point you just decide to do it. Ignore the feeling that you lack motivation. Grind through even one laughably small bit. Then repeat that, every day. Nothing changes, you just do it.
Sometimes you can, sometimes you can't.
*) adhd, medicated_depression, passed_one_therapy