When the trumpet sounds, what will you be found doing?
If you say, it's your passion, are you sure you'll still be doing it till the trumpet sounds? How do you sustain it till then? You've got to make your passion your food; your everyday thing. Food is what you eat that gives you the energy to work for more.
Is your passion energizing you enough to work harder to improve on it? If it's not, then you probably have not identified it as your strength, but if you have, then perhaps you've not honed it to expertise.
Consistently exercise and improve on your passion. Don't be afraid to make mistakes. Your success lies in the lessons you learn from mistakes. Keep at it, make it your source of joy, energy, and ultimately, fulfilment.
It's simple; use it to help humanity and earn from it. If you're not earning from your passion, be sure it'll die a natural death in a matter of time.
It's usefulness will drop, your enthusiasm towards it will wear out, and your commitment will plummet. It will become a waste of time, energy and resources.
Use your passion to help humanity and earn from it.
Fulfilment is embedded in those two.