madman

I am using truenas for couple of months. My server config: Ryzen 7 1800x 8Core X370 Gaming Pro Carbon 3x4Tb HDD 16Gb Ram D-Link 8port unmanaged switch Now I wanted to add a new Gbps NIC to make a 2Gbps cluster and also wanted to add 4TB storage. But for that I have to backup my data somewhere else, break the data cluster and then create a new 4x4tb cluster for storage. I can not even merge my two NICs for smb multichannel for increasing my bandwidth. What should I do, will moving to UNRAID help me?