Welcome to the Fiverr forums.
“Gig positions are not permanent and can rotate on a daily basis.”
This can be found here, https://sellers.fiverr.com/en/article/levels-warnings-and-status under Gig Status, in the second drop-down.
Is it possible to rank on the first page again?
In theory, yes, though it might take a few weeks.
Okay… Thank you!!