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You're not the first one.
There are so many apps that it is sometimes difficult to get ideas.
Of course there are games, but I do not find it is the most interesting category.
A way is to think of problems, not apps. In your day to day life, note each time you have a "problem" or just question. Just a few examples to illustrate:
- what is this bird I hear singing ?
- what is this song playing ? -> Shazam
If you are curious, you will find a lot of ideas. Take time then to elaborate to really understand the problem and discover the user value.
You will see, it is much fun to do it this way. Good luck and keep your best ideas until you have published the app…