If you backup your config now, you’d be able to apply the config to CE 2.7.x.

While this would limit you to an x86 type device, you wouldn’t be out of options.

I am an owner of an SG-3100 as well (we don’t use it anymore), but that device was what soured me on Netgate after using pfSense on a DIY router at our office for years…

I continued to use pfSense because of the sunk costs involved (time, experience, knowledge). This is likely the turning point.