Ethereum can never get to zero value no matter how bad the market may be.
Have you experience holding a shitcoin but it doesn't get to zero? So apparently even a shitcoin doesn't get to zero so what more for eth? Ethereum as second to largest blockchain will become worthless in an instance? I doubt that and you should be also. So yeah if you wanna sell then go, this is a free market and even we say that you better be holding that, I know you'll still do. Otherwise, I hope we won't see you trolling here saying you've loss your life savings.