Fiverr community is quite diversified, and its always pleasure to listen to different point of views from freelancer accross the world. This diversity makes it interesting for me.
Creating a duplicate/multiple account on Fiverr is not allowed. However you may consider to edit existing gig for improvements or create new/more gigs.
Feels like the buyer wanted to take you out of Fiverr platform instead of hacking your account.
I suggest you to take some time and read the TOS of Fiverr:
https://pro.fiverr.com/legal-portal/legal-terms/terms-of-service
It's a mystery to me how the success score works. It seems like almost every second seller is affected by it. I’m not sure how the AI behind these metrics operates, but it definitely leaves a lot of us puzzled.
Take some time to read the links below:
https://help.fiverr.com/hc/en-us/articles/360017140717-Seller-Plus-overview
https://pro.fiverr.com/?source=top_nav
Different people have different opinions about it, and it might be worth trying for a month or two to see how it works for you.
Personally, I didn’t find it to be worthwhile, but it’s always good to explore and see what suits your needs.