I have a great app with 10,000 downloads/ day and it's a unique idea but I don't have a money for marketing.
I founded one of the first independent app development studios just as App Store went live in 2008. In addition to building this successful indie studio, I've helped dozens of companies launch successful apps on App Store and Play Store.
Congratulations! Ten thousand downloads a day is a great start. It shows that you've found a sweet spot in the market that has a sizable potential user base.
Unless it's a paid app, however, there's nothing monetizable in downloads themselves. App engagement after download, on the other hand has inherent value.
If users are indeed engaging with your app, there are dozens of ways to generate revenues from that. Also, you can use that engagement to create content that is shared socially to increase downloads, return visits and longer usage.
I've work with app owners like you to make enhancements that ensure engagement, user content creation and sharing. Call me if you want to discuss how to do that.
I will try to not give you such a spammy response like the other answer here. Although I do agree, you don't really provide any information.
When it comes to marketing you need to realize that marketing in itself is not advertising - why do you think you need money for marketing? You definitely need it for advertising but depending on your app and your users you might have a world of opportunity to reach more and get more from these downloads than you might realize.
My name is Humberto Valle, and I am strategic competitive marketer and have been helping startups grow from zero to millions of dollars for about 10 years now. I run a marketing agency and do consulting calls for fun. If you want more direct clarity - send me a message and I will be of as much help as possible.
I have been doing app marketing since 2011 when not many people even knew what an app was. All the apps I have worked with have reached Top 5 either overall or in their categories and sometimes I can tell right away if an app is going to ever work or not. Since we don't know much about your app and in which categories it is competing, I can't tell if 10K downloads is impressive or not.
What I suggest is that you find a way to monetize your downloads, so you need to convert all those downloads into paying users. Again, since we do not much about your app it is hard to even suggest if in-app-purchase is good for you or you need another monetization method.
if you wish to talk more about this please give me a call. I'll be happy to help
If you have to pay for users, your app sucks.
What I mean is, your revenue model should be such that:
cost/install * installs/registrations * registrations/purchases < # purchases * revenue/purchase
That's a long-winded way of saying your revenue should be greater than your costs. The problem is, the cost to acquire users has become prohibitively expensive in the last 2 years. The cost to acquire users on Facebook has multiplied by 5-8x. So unless you're selling big ticket items, it doesn't make sense. If you're selling an app subscription or in-app purchases, you've pretty much got to go with organic growth.
So, subscribe wholeheartedly to the growth-hacking model. Ensure that your product has a high viral coefficient, meaning that the app experience gets better for you the more people you refer. Provide incentives to sign people up. Get people to share, and then get them to convert.
Once you've reached a solid growth velocity (double digit MoM), and your conversion rate is high, it'll be easy to get money to pour fuel onto the fire.