Advertising to many new People is the first step to promote bitcoin mass adoption.
Making those new People / Investors understand the basics of Bitcoin / Blockchain functionality, how good it is to have it in the real world (payment methods).
Which benefits come from using such cryptocurrency, how to exchange and so on.
Not going into deep informations as it might be confusing at start.
This is the best thing we can do. Imagine, even when each of us brings one Bitcoin investor to the market, BTC will be strengthened, and its price will grow greatly. The market cap will gain also!