Wow, this is the most ridiculous "advice" ever. I mean, just absolutely absurd. So terrible and outlandish I'm convinced it must be satire. Either its satire or its written by someone incredibly far removed from reality.

There's a ton more to deciding on a career than "I pick the thing that I find most interesting." I mean, c'mon...

Other factors (not inclusive):

What's the pay? How important is pay vs enjoyment of the work? Are you willing to sacrifice pay to do something you love? Are you willing to do a "meh" job that pays well for a few years to save up so you are in good financial shape to follow your passion?

Are other people relying on your income? How does your job choices affect them?

Hours? Will you be on call? Shift work? Mandatory unpaid overtime? Will this effect your marriage? Social life?

Is travel required and can you travel?

What's the realistic job outlook? I might find baseball the most interesting thing in the world, but making that into a career isn't feasible for everyone but the best of the best of the best. If I did pursue baseball, then I'd have to be willing to endure a poverty wage in the minor leagues for years with a 99% probability of never being called up to the majors. Even if I wanted to work a non-player role, what's the competition? Do I stand a chance?

Is it a job that requires luck and/or knowing the right people to get hired?

What's your fallback if this doesn't work out?

Do you have to relocate? Are you ok with that?

Do you have to go [back] to school? Crunch the numbers, does it make financial sense to go [back] to school?

Is your spouse ok with all these choices? When you're married you are a team and negotiation must happen.

Are you ok with turning something you love into something you hate? That's the biggest issue with making a "passion" into a job, it can become a chore and you can grow to hate it. Just because you love doing it in your free time doesn't mean you will love doing it when you have to.

Just because you really enjoy something doesn't mean you're good enough for someone to pay you to do it. Be realistic here, most people aren't going to get paid to do a hobby.

Just because you really enjoy doing something for yourself doesn't mean you'd really enjoy doing something for someone else. If you love building websites for yourself using your own technology stack at your own pace doesn't mean you'd love building websites for someone else, to their exact specifications, with a technology stack you didn't choose, and half of it is maintaining someone else's legacy code.

Do you have an entrepreneurial spirit or are you happier with being a cog in the machine?

Consider health concerns.

Work life balance?

If you're interested in learning something, what's the barrier to entry? Do you have to buy a lot of expensive equipment to get started? If you do, do you have both the money and the physical space for this equipment? Is teaching yourself this activity dangerous?

If you pick a job based on "things I'm interested in," you miss out on the jobs you don't even know exist yet.

Most jobs you can't have as a "side project" first. You can't be an lawyer on the side to see if you'd like to make it a career. Nor can you be an optometrist, medical biller, security guard, nuclear engineer, HVAC technician, veterinarian, offshore oil rigger, flight attendant, police officer, solider, mortician, plus an a million other things.

Finally, in the real world most jobs aren't particularity interesting nor do they usually give you "energy"! Learn to deal with it, this is real life, not some fantasy land. If you get to turn something you enjoy into something you are paid handsomely for, you're incredibly lucky. 99% of jobs out there are simply a means to an end.