Passion comes from having interest. Interest comes from noticing particular facets about something that amuse you, perhaps because they are mysterious or perhap

Passion comes from having interest. Interest comes from noticing particular facets about something that amuse you, perhaps because they are mysterious or perhaps because they give you pleasure. So if you want to become passionate about something, search for aspects about it that amuse you and focus on those things. That's not the whole story, but it's a start. It's worked for me at least.