As a Tapastic Staff member who frequently witness such event, let me share my view. I am excluding those creators who had fans elsewhere. I'm talking about people who started from scratch (or almost scratch).
1) First of all, talk to Tapastic Staff like @michaelson and me. I'm not joking. We love talking to Tapastic users so don't be shy. Within the past 2 years, we've talked to thousands of creators big and small from different continents. I can't say our advice will be 100% correct, but I think we do give good advice.
2) Don't overthink. Take a step back. Let's not even talking about comics here. How do you get fans? It's all about winning over people with your charm. We have some superusers on Tapastic like @codesurfer23 and @ametueraspirant who have "fans" on Tapastic without even drawing a single panel. They participate in the community and just talk to a lot of people. They give good advice, they make others feel good about their work, etc.
3) Now, back to comics. Make something appealing to your readers. If you have the skills to make amazing art like Fisheye Placebo, you certainly do have an advantage. For the rest, it's about quality storytelling (flow) + relatable art. You make a simple drawing into something amazing. We all know xkcd. We all know Cynide & Happiness. Other examples on Tapastic I can think of off the top of my head - Girls in Real Life and Cheer Up Emo Kid.
Remember the first time you made comics? Who did you show it to? Did your they like it? Why? Take the reason and multiply it. Comics at its core is all about sharing, sharing, and sharing WITH SOMEONE. We find so many people who forgot about what comics really are. Which leads me to my next point...
4) Find your audience and promote yourself. How many subscribers do you have? Less than 100. Do you have 100 friends on Facebook? Why aren't they reading your comic? If you can't get 100 of your closest friends to read your comic, how are you going to get thousands or millions of strangers to read your comic? Think about it... maybe you should start from beginning. Figure out to make something for your small circle.
5) Work your ass off. There is not shortcut to getting subscribers. When you get a few subscribers, take care of them. Talk to them. Become their best friends and make something cool for them. Be sure to experiment. Don't be stubborn. Change your style here and there. If your first comic series does work, try to figure out why, learn from it, and try another series.
I'll leave it here for now...there's so much...
I'm sorry to say that putting a comic on the front page does not result in instant subscribers. Unless the comic and the creator we feature possess that "charm," it will never do well no matter how many times we feature it. On the other hand, you make something great and work hard, others will begin to notice. Tapastic community will begin to notice. Tapastic staff will notice.