Advice that my father gave my siblings and me, "Make a career out of a field you're interested in, with colleagues you can tolerate, that affords a standard of living you can accept." All three of these criteria are fairly weak individually. The first is not passion, merely interest. The second is just "tolerate". And the last one is flexible in that people may have different expectations in income. The power is when all three combine: they should hopefully form a life of decent work experience and financial stability. Admittedly a lot more pagmatic than finding and making a career out of the thing you enjoy most - but considerably more achievable.

There are plenty of things I am more passionate about than software development, but doesn't fulfill the other two categories. Those make for good hobbies, but usually not good careers.