Open System Settings
Click Lock Screen
Set “Turn display off on battery when inactive” to Never
Set “Turn display off on power adapter when inactive” to Never
Open System Settings
Click Battery
Turn off “Put hard disks to sleep when possible” if available
Open Terminal
Run `caffeinate`
Run `caffeinate -dimsu` to keep the Mac awake
Keep the Mac plugged into power
Disable screen saver if needed
Close unused apps that may trigger sleep settings
Check for scheduled sleep in Energy settings if using an older macOS version