Look for societal, business or technology change.

That is where NEW opportunity lies.

Also, copy the best new ideas you see on hacker news, it’s far from guaranteed that the inventor is able to win the market, steal it.

If a market was not ready for an early solution, it may become ready years later, due to infrastructure, mature technology or the business environment. In that scenario, it's sometimes possible to recruit customers, employees and or even investors from earlier attempts to serve a market.

Being a fast follower is very good approach.

Let someone else burn money educating users and building a market.

Tuck in behind them and then zoom past when they’ve exhausted themselves.

Cruel - but it works.

I agree, when the environment changes, new things become possible.