Simple tool to toggle your WiFi internet sharing on MacOS, based on this solution: https://apple.stackexchange.com/a/181404

How to use:

1. Download the tool
2. Open System Preferences > Network
3. Highlight the interface you want to share your connection FROM and click the gear below the interface list
4. Select 'Duplicate Service...'
5. Name the duplicated service "Internet share toggle" (without the quotes)
6. Set the service to 'DHCP with manual address' and input a valid IP