This idea is what I remember from a talk given by Dr. John Townsend in 2010.

Passion is loving what you do.

Ability is being good at what you do.

Meaning is believing that what you do makes a difference that matters.

The sweet spot is the overlap of all three – doing something you love, you’re good at, and that matters.

A huge range of abilities can be developed, so there’s no need to limit yourself to the abilities you already have.

A huge range of activities are potentially meaningful, so that doesn’t narrow the field much either.

Passion is different, it’s unique to you. So look at what you love first, then look at what ability and meaning you can pair with your passions. Far better to learn a new skill to enable your passion that to spend a life doing something you’re already good at, but don’t care about.

P.S. Having a day job that fits your passion is a wonderful privilege, but it’s not always a realistic possibility. If you can’t do what you love for a living, there may still be good reason to keep your day job. Plenty of passions are brought to life outside of working hours.