Somewhere within the extended project you’ll find the soul of your work
It’s true, for all kinds of reasons. Maybe the biggest is that when you have time to photograph you don’t have to get started, to build up momentum. You just take up where you left off. In my book, Looking into the Light, I have this chapter in which I use my own experience(s) to lay out what a project can do for you, with examples. Read it and see what it tells/shows you. Then start something.
For example, when I was in Cuba recently I went out at dawn each morning and photographed in the empty streets. This is the only time they are empty, and I was able to make a whole series of the light in Havana in the margin between day and night. This is the time of day that the great Eugene Atget got his evocative studies of Paris at the turn of the last century. (Talk about a project!)