upgrade 7.x

Dear ProxMox users, I need help about the upgrade my installation. I'm running proxmox cluster with 2 nodes. I'm plan to add a new node. If I undestand version 7.x is near to EOL. Now, I try to update my 2 nodes from 7.x to 7.4. Then I'll add a new node with proxmox 8.x and finally I'll...