I joined Fiverr exactly one year ago and I was promoted to Level 2 Seller almost one year to the day! I have had (and still have) slow periods, deal with hard to please customers, scammers, and changing rules, but I tried to be professional and deliver the best product possible every time. If you treat every $5 order the same way you treat a $250 order, you will succeed. It may take time, but you will succeed. Under promise to your buyers, then over deliver and blow them away with you too rated service and product!
I love working on Fiverr! It has made me a better voice talent and better at customer service, as well as made me better at running my business.