Comment by light_triad

To go big you first have to dominate a small market. Every big success started as a niche. It's not so much that you can pick the size of the success ahead of time, but rather make sure to increase the odds that things will work at all.

My advice:

1) target a large TAM - is there a large enough market of people that are willing to pay for that type of solution?

2) try to maximise problem-founder fit - what are your unfair advantages and do you have access to early adopters who can give you feedback and spread the word?