I have been in the Mobile space for the last five years and this is one of the most recurring issues my clients come to me with. What you should do is analyze how many different apps there are for that specific game. For example if your app is another version of 2048, you're going to have a hard time attaining market share unless you have a vast amount of capital. I would advise you on creating a advertising campaign to attract more users to your game. However, before putting more money into it, do research on wether it is even feasible doing so due to the vast amount of apps that are already out there. If you have any follow up questions, I am available to take your call. I am currently doing a one-time free 15 minute call so send me a message for the link.

Kind regards,

Giuliano