Solve a problem that people have, in a simpler way than before, aim much simple. So simple that it makes no sense to use the old ways.

If the solution to the problem you are solving is just an incremental solution to the already existing ones, then most likely you will fail.

It is better to spend quite some time on the white board before even thinking to get near a keyboard to code.

Solve a problem in a way that, when you explain it to knowledgeable people they would react somethink like 'I wish that existed' or 'If only' or 'I want in'.

Take care and keep going