First and foremost, you have to be healthy, mentally, emotionally, and physically (yes, physically). If you are not up to par, get these out of the way, first.

First and foremost, you have to be healthy, mentally, emotionally, and physically (yes, physically). If you are not up to par, get these out of the way, first. Go to the gym, sleep well, eat well, don't consume mind-altering substances (for me, even caffeine has been shown to hurt my performance), don't be in an unhealthy relationship that is a constant distraction. I like to think of mental performance as a racing engine. You can have a dirty fuel filter, and not notice it because the air filter is plugged, and the spark plugs are misfiring. Only once everything else is fixed, do you begin to feel the horsepower from all cylinders firing. Another thing that has helped me immensely, is listening to Jordan Peterson. If you can get beyond his political bent, you realize that he has a lot to teach to motivate. The main take away that has helped me become motivated, is the realization that you must be working towards something that is both difficult, and will significantly change your life. Listening to his lectures has helped me go back to working on a project that I had stalled for a year, and I have been working 40+ hours on it each week for months now (In addition to my 40 hour regular job).