>>3474160I’d like to make an upgrade soon so I can take better low-light photos
the 80d is better than the 1300d for low light but not significantly
what you really want is better glass but an upgrade from that body will also help.
I'd really suggest going full frame if you want to go low light but the 80d is an option and definitely is an upgrade, maybe even save a bit and get the 70d with a 35mm f/2.0 instead.
I just looked at the price again and I swear the 5d3 was much cheaper than it was going for on ebay, at least the original 6d is pretty affordable with pretty up to date iso performance.
switching is also a possibility because the d800 is extremely cheap for what it is, a professional grade camera and a direct competitor to the 5d3 with modern iso performance.
or here's another idea, get a tripod instead which will increase your low light way more than a new camera, probably won't help you that much in handheld though.
also ignore how well the d7200 holds up to the 5d3 in this picture because in the real world the difference will be way more pronounced.
what's your budget?