Can we ask our returning buyers to give more work or for review?
Never ask buyer give review. It’s TOS violation.
I’d suggest that you don’t do that. Don’t ask them directly. Alternatively, you could just leave some subtle hints (say, while leaving a review after order completion) that you would love to work with them in the future.
But asking them directly can get you in a load of trouble. If you do that, the buyers will have a legit reason to report you to Fiverr for spam and that could even lead to your account getting disabled.
Thank you very much.
Only if you want them to think that you’re begging them for work, or if you want them to block you or report you for spamming.
If they’re happy with your work and need your services again, they will return on their own.