How did you decide what focus on in the early stages?

I've been trying a few different ideas recently and I running into the same issue – it's hard to no what's actually worth committing to long term.

Some things feel exciting at first but fade quikly, while others seem more solid but harder to stay consistent with.

I'm starting to think the real chalenge isn’t finding the "perfect idea", but sticking with something long enough to see if it works.

For those who are further along, how did you decide what to focus on early on?