What keeps me going is goals.
Take a look at your natural river. What are you? Stop playing games with yourself. Where's your river going? Are you riding with it? Or are you rowing against it? Don't you see that there is no effort if you're riding with your river?
One way to keep momentum going is to have constantly greater goals.
Man was created as a being who should constantly keep improving, a being who on reaching one goal sets a higher one.
If the table moves, move with it.