Your target customer would be someone who is in need of the service you offer. Take for instance your business card gig. Your target customer would be business owners, entrepreneurs, lawyers, or pretty much anyone who you can think of who would need a business card. Now to use Jonbaas’ advice, do some research on where you can find those people online and offline. Advertise to those specific groups about your fiverr gig. Facebook and other social media is a great place to find large groups of people who would need your services. Unfortunately, not many people would come to fiverr looking for business card design, so it’s up to you to bring them here by advertising your gig.
Another piece of advice, and I mean no disrespect, but the grammar and punctuation on your business card gig isn’t very good. I would suggest you have a native English speaker or someone who is more fluent to help you write your gig description. Having a well written and legible description will help a lot!
I hope this helps.