Well everyday the tapastic staff choose 5 comics and those comics are presented on the main page of tapastic on the "staff picks section'', and on the mobile app of tapastic there is a special notification with the 5 comics. I will make some research tomorrow and try to find a way to send your comic to the tapastic staff. ^^ (I found this on the tapastic forum, I don't have read everythings but if you want to see : http://forums.tapastic.com/t/how-do-i-get-more-subscribers/9553 )
I made some research but I was wrong : I thought that was the creators that sent their comics to the tapastic staff and then they choose, but it's just the tapastic staff who choose a comic... But I shared your comic on a forum of tapastic called 'comic with less than 100 subscribers'. I hope it will work !