Another thing that causes buzz is lights.  Is the buzzing worse when your lights are on?

Are your lights on a dimmer switch?  A lot of dimmer circuits cause bad interference

Buzzing problems are really hard to trace.  If you can, identify where your buzz is coming from.  Firstly, simplify your rig to just your amp and guitar plugged in via a single cable.  No other electronics, no pedals, computers, phones, anything else in the room.  Lights off, no fans, no a/c, nothing else.  Bare minimum.

Is the buzz still there?

If not, then your buzz originates from the other parts of your rig like pedals, or your laptop, etc.

If so, then next step would be to try to diagnose the guitar and amp separately to see if it is a guitar ground issue or an amp ground issue.  How exactly you do that I don't know, maybe someone else can help.  But if you eliminate your guitar and amp as the originator of the buzz then your fault may be your house wiring

That's all I got mate, but it may help you part of the way.  Good luck with it