Why my app ranking was dropped after it was ranked #1 for a keyword post promotion?

Typically, if you stop promoting the keyword after it reaches the top position and the organic traffic is not sufficient, the keyword ranking may decline.

To maintain your keyword ranking, consider supporting it with a certain number of daily installs. To prevent this kind of drop, it's important to choose a valuable keyword with a large search volume and, if necessary, continue purchasing keyword installs for your app on a regular basis.