On Enjoyment and Fulfillment

What makes one thing more enjoyable and fulfilling than another?

Personally, I don’t think I’ve found anything that qualifies as fulfilling. Or perhaps what I’ve felt before (what I would say is “enjoyment”) is what others say is fulfillment.

But video games are enjoyable too. If I had all of my other needs taken care of, would I be able to play video games all the time? I honestly don’t know.

I chose computer science because I saw it as the highest leverage point for helping others. But I’ve never experienced fulfillment while doing that work.

Trading is enjoyable, so is theoretical physics. Will using computer science to help others result in fulfillment at the sacrifice of enjoyment over the other two?

I guess there’s only one way to find out…