Youre not supposed to feel motivated all the time.
whether its work, hobbies, a passion, anything in life.
Thats not how it works, motivation along with feelings and come and go just as day and night does, its the way of the world, the key is not to feed into it, when your super motivated make the most of it, when your not motivated just plough on, it will return
Motivation is a lie, the only thing that matters is commitment. When you have commitment to do the thing regardless motivation doesnt come into it. Like going to the gym, who wants to go to the gym? but you just go because you know why you are going