1. Search Engine Optimization, just like what others already told you. Start with the keywords, images, links, etc.
2. Patience. You need to wait to feel it. 2 weeks isn't enough, I tell you. This is based on my experience.
3. Invest on the right platforms. Do not buy an app just because your friend told you so. You might end up investing on something that you don't really need.
4. Research. There are lots of materials you could use online. Read and follow number 2.
5. Weigh the information you gathered. We can say different things in this forum but it would always boil down to your own intuition of what you think is better.