Honestly, keep working, be patient, and be friendly. I myself don't have many subscribers and feel a bit down at times (I actually feel below many others on this site). Reaching out an commenting on others might help you or at least tell people you exist. Honestly, the subscribers will rise when your not paying attention, or even care as much.
Really, enjoy other parts of your life, keep working, and be patient. You do this because it's fun, not for profit (though that would be nice). Also you could try finding groups of people on other sites that might enjoy it and link it back here.