Over half of my buyers come back repeatedly for multiple orders. If you have a great service you will find that your fiverr business keeps growing over time. I have clients who have come to buy my gigs for years. Recently when all my impressions dropped lower than they have ever been in the past two years, I managed to continue to deliver about 75% of my previous income thanks to previous buyers.
Only about 25% of my business is from new clients.
If you want to make fiverr your full time business find a way to keep buyers coming back multiple times. You won’t mind the inevitable changes in your impressions nearly as much.