Nice setup! I have a very similar Homelab minus the Generac (I regret not getting one before inflation kicked in, especially since I already have LNG to the home.)
My only recommendation would be switching your virtualization over to Proxmox (LXC / KVM) and setting up an HA cluster with Ceph and MLAG. It's relatively easy and free and will give you a lot more features than plain ESXi and even free vSphere/vCenter.
Yeah, the price on this genset I think has gone up around $4000 since I bought it, not including the install
I've been meaning to try Proxmox, but my day job heavily relies on ESXi, so its nice having something to mess with at home. I am also running vSphere with an Enterprise licence, so I get all the fancy stuff
My only recommendation would be switching your virtualization over to Proxmox (LXC / KVM) and setting up an HA cluster with Ceph and MLAG. It's relatively easy and free and will give you a lot more features than plain ESXi and even free vSphere/vCenter.