Welcome to the forum.
We are never good enough (always something we don't know or don't master).
Clearly, if your intent is to compete with Open AI or similar, that's certainly out of reach.
But there are many examples of success stories, even when the field appeared crowded and controlled by a few major.
If you are the developer, it's clear you need good technical competencies about iOS development, but if you keep your app simple at start, you don't need to be a technical genius.
In your case, I could see a few success factors (take it for what it's worth):
the quality and originality of your app (game or other): that's the hardest part. But don't try to mimic and compete with an existing blockbuster
keep focused on a strong value proposition: you have to understand why your app will be uniquely appealing to users (even if it is a limited population, that's enough to start with).
This means that the app may be simple, not requiring extraordinary technical skills, as long as it delivers a unique value proposition
spend time to fine tune your marketing plan.
Good luck.