Hi, this is Ann, a business coach with a lot of experience in strategic planning and marketing.

To me, you did a very great job. You ran some beta test to know what the customers really wanted and also estimated how much the app would generate. To be honest, not a lot of entrepreneurs can do the same.
Next, I will summarize your situation in my own words, so feel free to correct me if I get you wrong. You have already developed an app and also done some tests with it and known what should be done next. However, the app is running in a competitive industry that there is few differences between the apps and sometimes you feel like all of the apps are just following the trend and hardly bring any (real) value to the customers. Hence, you want to do something different that really brings what the customers deserve.
To be honest, after a long time working for startup companies, I realize that only a few of them really suceed. In most cases, the successful ones are the ones that care about customers the most. So, by upgrading your app constantly, you already bring them some real values.
However, if you really want to do something else because you want to create offer the world what really matters, I suggest you do some deep inner work. It is because that I know so many people (actually including me) wanting to do something really amazing but they cannot finish it because that is not what they want to live their entire life with. A business that creates great values requires a great amount of passion that may take you an entire life. Do you really want it? In addition, you may need some financial support or at least some base/foundation (that's why we have KickStart and Indiegogo). If I were you, I would consider 2 solutions below:

After finishing my deep inner work, I would know what value I wanted to bring to people.
1. Then, I would consider whether I could develop the existing app towards that direction or not
2. I would still work on the app to generate some money so that I could use it for my ultimate purpose. I was half-way there, I would not think I should quit.

These are just my suggestions, which can be biased. The choice is yours. You know what you're doing best! If you find my answer helpful, you can have a look and take it as a referrence.

Should you need any help/motivation, don't forget Ann is here to help!

Have a nice day!