Don't be too hard on yourself. Recently, I had to deal with the same topic. A neighbor asked at a bbq - what are you passionate about? He would not take "I don't know" for an answer. That got me to thinking and I came to some of the same conclusions you did. Namely, that my involvement with JWism for 30+ years had robbed me of the opportunity to find out.
After giving it some thought, I think that some of us are just generalists. I'm very interested in a wide variety of things, but if I had to pick one to the exclusion of the others, I would be hard pressed. Just be open to new activities. Maybe one will catch on. Who knows what is could lead to. At the moment, I would have to say that my favorite activity is just wandering around in the forest seeing what I can find.