Some thoughts...
Tops-down (A new technology or regulation came out and I want to methodologically navigate what can be uniquely built as a result)
Bottoms-up (I experienced this problem, and built X to solve it)
Both can work, but there's a stigma against tops-down.
1/ Celebrate "distance traveled" on an idea rather than the landing on an idea.
Why does this happen?
They meet ppl who ask them, "what are you doing?"
They panic, "well, I don't want to be a dabbler for the rest of my life" and pick an idea.
They do some research read some papers talk to a couple people and conclude "there's an opportunity!"
But they don't go deep enough to deeply understand their first customer, their pain points, and how to reach more.
Instead, find the little thing you can execute against for the next few months....that you can see is leading to this larger thing.