If I was down 30%, I would wait it out. I have never and will never sell altcoins unless in profit. Because I made a commitment to myself that this is an investment. Either it goes to zero (which it never does) or I get a profit some time in the future. All or nothing attitude is key. It destroys buying remorse.

short story: I was down 60% in NEO and still got a 200% profit out of it...
It takes time, but the direction of haejins and my posts is usually correct.

Without that mentality, investing is like gambling... addictive and hurtful.