CraftKing7777:
The thing is, I need the LED to be faded on and then the code goes back to the beginning to be ready for another request from the amazon echo.
That is exactly what a for loop will do for you. Once it has finished the program will carry on at the next statement.
Wrap
analogWrite(D8, fadeValue);
fadeValue = fadeValue += 10;
delay(30);
in a for loop where you want the fade up to happen. The number of steps and the increment value will control the rate at which the LED fades up.