So, here it is:
Assuming that you would like to get your gig/profile rating back to 5 stars (which is impossible) all you could do is pumping up your gig rating to 4,96 stars (it might be rounded-up to 5 or rounded-down to 4,9).
If my calculation is not wrong, you will need to get 91 of 5 stars reviews to get your gig rating back to nearly 5 stars.
Based on your statement, I believe you depend solely on buyers from this platform. Since your gig rating dropped, I’m quite sure that your gig has been lowered down in the listing, which mean that buyers might not reach page where your gig is listed.
Optimizing your gig SEO and tags will help you, but it is not much. Remember, your gig rating and listing has dropped.
So for a moment, focus yourself on marketing your gig outside of Fiverr.
HOW IT COULD BE DONE?
Tweet between 3-5 PM (Pacific time) about your service. Use maximum 3 hashtags which related to your target market.
But please remember, make a good copy (which if someone read it, they know that your service is the answer for their problems) both in your tweet and gig description, so you will likely convert visitor to customer.
But don’t expect to much on this, just do it consistently. You’ll be surprised on how many clicks you will get by using this trick :)