How to change refresh rate on an external display on macOS

fix-refresh-rate.sh

# install homebrew
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

# install cscreen
brew cask install cscreen

# list displays
cscreen -l
# find your external screen in the list and write the number (not the ID) down somewhere
# in the following instructions, use that number instead of <SCREEN>

# list display modes for your external screen
cscreen -s <SCREEN> -v

# find a display mode you like and run
cscreen -s <SCREEN> -x <WIDTH> -y <HEIGHT> -r <REFRESH_RATE>

# enjoy!

install cscreen
brew install --cask cscreen

Thanks, for that, it really helped me