Because you sat your course more than a year ago you'll have to sit another course from VMware Education. I recommend the on-demand version of the vSphere What's New class. It will help you to get skilled up on vSphere 7. Let me restate: no matter what you do, you will have to take another class.
https://mylearn.vmware.com/mgrReg/courses.cfm?ui=www_edu&a=one&id_subject=93887
From there you'll be able to sit for the VCP-DCV 2021 exam.
Good luck,
Joe
