Looks like you need to have the VCP for 2023 or 2022, using this page as an example: https://www.vmware.com/learning/certification/vcap-dcv-deploy.html
As you completed your VCP in 2021, you'll first need to update that to 2023 before you would qualify for VCAP, check the "VCP-DCV 2020 or later" path here: https://www.vmware.com/learning/certification/vcp-dcv.html
In short, you need to pass an exam to update your VCP first - how you prepare for that exam is up to you.
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