Two things: - Starting in a niche, then expanding into really competitive markets worked we'll for us - Try every that's cheap to try. In advertisement, you w

Two things: - Starting in a niche, then expanding into really competitive markets worked we'll for us - Try every that's cheap to try. In advertisement, you want to spend a few dozen $ on everyone who's willing to take them, then invest heavily when ROI is positive. There are many people who just do google and maybe Facebook. But while that's 90% of their market, you sometimes get lucky and find a niche that gets you as much revenue as the two combined.