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Well, I made a rookie mistake. When I assigned the static IP to the interface, I hadn't changed it to /24, it was at /32...
I'm well and functional now.
Thanks for the help!

I've removed the switch from the equation. I had tried setting up a vlan but that did not work for me.
I have now wired direct from the External interface on my OPNSense machine to a single NIC on the server. I separated that into a new virtual switch and assigned my VMs to it. I connected another NIC to my switch for the management interface, on a separate vSwitch. This should safely separate the networks without vlans. However I still am unable to contact any of my hosted applications, and the hosted applications cannot reach the internet. I cannot ping the interface either, from the VMs.

Hello!

I had initially set up OPNSense as a VM on my server. However, this was causing performance issues and heavily delayed responses from the web GUI. Not bad enough that it bothered me, but I eventually opted for a bare-metal solution to have dedicated resources for OPNSense.
I had copied my config over, and assigned the correct interfaces. However, now I am facing an issue where I cannot access any of my hosted applications on the server. Since they are internet facing (accepting inbound on 80/443), I had put them on a separate subnet - 192.168.3.0/24 - from my standard LAN subnet - 192.168.1.0/24. This  was working before, as the hosted applications all had static IPs. Now there is no connectivity between that subnet and OPNSense. I can access the ESXI GUI with no issues, as that is static ip'd to my LAN subnet. My server has four NICs, which I have aggregated on a virtual switch, and assigned to the hosted applications. Those four NICs all plug into my managed switch. No VLAN setups or anything. I've also got the interface the hosted applications are on, connected to the switch.

I'm not sure if this is a configuration issue with OPNSense, or my ESXI setup. I have attached a diagram of what the setup now looks like.

Thank you!