I just want to make sure that it's clear that I too don't think there is 'one' formula for any of this. Following your heart means to be open to whatever strikes our fancy. Whether it's fresh or not doesn't matter, as long as we enjoy it.
I confess that the most fun I've had with photography in the last few weeks is - prepare to be shocked - playing with my iPhone. Now if I disregard the fun of that I would not be true to myself. Ha. There. I said it. I doubt it will last, however. As with all other things, the only thing that has remained constant throughout my time spent with photography is film, chemistry, and darkroom. Everything else surrounding it has changed, but the pure base for me is film and darkroom. What's around the corner? Who knows. But I'll keep on trucking as long as I enjoy what I'm doing.