“there were a couple that had been out for a couple years but none of them were successful yet That's when I realized that there was like an opening there... I think if there are a couple apps that's a good sign because they people have built it people want it just no one's really marketed it like successfully yet”

Target the "2-4 mediocre apps already exist" sweet spot, not the empty niche

The ideal target niche has 2-4 unsuccessful apps already on the store — not zero (unvalidated) and not one breakout winner (too late). Existing-but-failing apps prove demand and hand you a free corpus of reviews to mine. You're looking for trends where social-media momentum has outrun the App Store: the demand wave exists but nobody has matched it with marketing yet.