Best way to reach me is email. Note I might not respond immediately because I'm playing golf, basketball, tennis, working, or hiking through a National Park.
Write a Review on App Store
I respond to reviews as soon as I get them, note that Apple takes hours to process the review. Reviews help let potential customers know how cool my app is. Thank you for taking time to write one.
Social Media
I focus on engineering my app and enjoying my life. Social media reduces time for those more important things. For a quicker response, try email.