This is a challenge with almost every long term goal that people face. Once you start down the long journey of that goal, it can become very difficult to actually detect any sort of forward progress on that goal in your day to day life. You are making progress, but it doesn’t feel like you’re making any progress, and that can go on and on and on.
While much of the advice for handling the “boring middle” works well in terms of developing a sustainable pattern of behavior so that you can keep on moving forward even when it’s boring, it doesn’t help much with this very real issue. The only suggestion that really touches on this at all is developing milestones along the way and celebrating those milestones in a non-disruptive way.