My definition for passion is something you need to do, despite having reason not to do it. It's the itch you have to scratch. It comes from the word pati/passio = to suffer.
Passionate people suffer when they don't do the work, so they end up going through the pain of doing it anyway. These people wake up at 5 and do the work, because they just can't do anything else.
I think the trick is finding something you're curious about.
Curiosity comes from being open to different outcomes. When you take something seriously (including finding passion), you're forcing a specific outcome. I'm passionate about cooking. If you give me a steak, I will look for the effect of specific cuts. Can I make a great steak from cheap cuts? Does it taste better with butter and garlic? What can I marinade steak in? Does baking soda make steak more tender? If drier steaks are better, would freeze drying a steak make it better?
Someone who is serious about cooking steaks will only look for the best possible outcome, and probably try to imitate the best recipe and such. There's techniques to arouse curiosity. Meditation has several, but there's also something like Pirsig's Brick.
The other step is commitment. It's tough for a 20 year old. Back then, I did lots of stuff: AI, VR, robotic exoskeletons, solar cars, voice processing, cryptography. Wasn't willing to commit to anything, and somehow got less done than people who committed to something. Until I took a job and was forced to commit to web and mobile development.
Commitment also requires a kind of death of an identity. By committing myself to mobile dev, I'm also committing to not becoming a game developer or an electrical engineer. I get rid of the distractions, and have more headroom to master a certain niche.