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!!
I think your gig is not active now, go to top menu gig, then click on your gig title, in the left you will see gig status its active or not active. Have a good day.