I'm building iOS Apps as a solo builder. Sometimes it's a little lonely. If you are interested in sharing experiences, advice, or just chat about ideas/programming/tech or collaborate, say hello at my contact is in my profile.
I've been building iOS apps as a solo builder for nine years and definitely agree that it gets lonely, both in the development of it and then waiting for users to stumble across it.
Maybe its time to focus on marketing and product fit ;-)