How to increase Magic Mouse speed?

The Magic Mouse is DRAMATICALLY slow. It is set to the fastest, of course. I tried disconnecting and removing it, didn't help. I tried setting defaults write -g com.apple.mouse.scaling to high values, but right now I'm on 5000000000000000000000000000000000000000000000000000 and still it is to slow, and it seems like increasing the value doesn't change anything - using the mouse for a longer time, with external monitor, still is a pain for whole arm. I heard there are some apps that could help, but they seem not to work in 2021.

Can I get any more ideas, how can I make it work correctly?