If you want to "raise more money", you could add more advanced features and add in-app purchases for them. Statistically, about 5% of app users pay for in app purchases (but obviously depends on what features you add). Alternatively, add advertisements, or just use the existing income you're already getting to work on your next app.

In terms of getting investment:
If you coded the app yourself, and you're getting >$10k from it each week, sounds like you can continue to develop it, and anything else, without any need to give up equity for an investment. Meanwhile, if you only made $10k the first week, and now aren't making anything off of it, you're not going to get investment.

If you'd like to go over it in more detail, with regard to the specifics of your app let me know,

best,

Lee