Fuse box with switch extension

Hi,

I have this fuse box with switch connecting my roof attic fan. Please see attachment for info.

This fuse box with switch is in my garage and is at height where i have to use ladder to turn it on or off if i want to do it manually. Attic fan is control by thermostat but i want to control it myself rather than turning it on/off automatically. With that said, how can i extend this whole box or just a switch at normal height? As you see in picture, i can't pull the wire which is going in drywall any further down to move that entire box at acceptable height however there is a junction box right below this switch if that can can help you to come up with some idea.

Appreciate all your help.

Thanks