Instead, ask yourself: 1) Who are our clients / users? 2) What are their pains, how does our app solve those, and why would they buys/use our app? 3) Where are those clients - and therefore how do we get in front of them?
As an extreme example, the best way to promote a fashion app for 16-year-old girls will be quite different to a finance app for high net worth individuals.
I heartily recommend the book Traction for a thorough list of options and how to approach them. (The list is included in the free preview, if you're strapped for cash, but the extra information is worth buying a copy.)
Best of luck!