Where do you promote your iOS App ?

Most importantly - where do your potential customers hang out? What do they do? Is there a way you can market to them in those moments? For the specifics of an iOS App - Are you doing or planning to do any sorts of ASO today? Additionally you can promote on Reddit, there are some subreddits that permit self-promotion. Alternatively, try to find the people who have the problem that your app solves and recommend it as a solution to their problems.