I've been through something like this. It is very difficult to accept and feel the stress. If you stop, then you really lose. Not a matter of money loss, but it is important to learn from failure.
I do not stop and pick another coin and focus on BEF.
Spirit
Without loss we'll not know where our mistakes in trading. Whether the undercooked analysis factor is in a hurry to decide whether to sell or buy, or because our emotional factors are less stable then maybe because we dont understand money management in trading. Learn the mistakes and keep on trading.
Well he doesn't know on how to act correctly in this kind of situation since im so sure that he gets rattled for the result when certain coins he's holding to gets dump, But if he acts wise unto it and accumulate more when its on dumping stage well the big provabilities to gain well be achieved by him. And now he shouldn't think to quit and better to learn from this so that he can act and think correctly while doing some trades next time.