You know, right this second I am listening to a MIDI recreation of the soundtrack to a very obscure German Atari ST puzzle game from '84. Something somebody recreated where I would be surprised if more than 500 people in the world ever heard the original.
Even though you might never learn of it, given the vast number of people out there, it is entirely likely that what you did already touched somebody out there. You do not need to have built a community in order to have done something of significance.