Hi,
For migrating from ESXi 6.5 to new hardware powered by ESXi 8.0, I recommend you check out the official VMware documentation and related discussions in the community.
Additionally, I found an article about moving virtual machines from one ESXi host to another that might be helpful to you. The article is titled "How to Move VM from One ESXi Host to Another in 4 Ways?" and you can find it at the following link: https://www.vinchin.com/vm-migration/move-vm-from-one- esxi-host-to-another.html.
Hope this information is helpful to you.
Good luck with your migration