You should suppress the two braces in the middle of your loop()
void loop()
{
Serial.print("forward");
forward();
delay(3000);
Serial.print("pause");
digitalWrite(enablePin, LOW);
delay(2000);
Serial.print("backwards");
backwards();
delay(3000);
} |<------------|
{ |<------------|
servo1.write(180) ; | |
delay(1000); | This part of code |
servo1.write(0); | is never executed |
delay(1000); | because of that -----
}