I have been working on fiver for more than one year i am level two seller with 800 positive reviews and i am earning more than $1600 per month .
I have Some tips for you to become successful on fiver
Continuously work on fiver and share your gigs where ever you can like Facebook , twitter and all other social media also Facebook groups it will increase your traffic and also your sales
Also if you can invest you must invest on your gigs you can increase sales by investing on your gig.
Also if you can share your gig on blog you have option for sharing your gig on Blog it is legal you can check it by longing into your account and on top right corner on sailing there will be option of promote your business there will be some code you can share that code to your blog that will surely increase your sales thanks
I hope this will help you to increase your sales !!!