It depends on your trading strategy. If you think the altcoins have potential and plan to hold for the long term, there is no point to sell if the price dip. You never know when the altcoins are rising again.
How many of them have passed before us, and it is difficult to count. And how much remained afloat? That's right, fewer times. Survived and continued to develop only the best developments, those that were able to offer consumers new interesting ways of working, broad opportunities in application and tempting prospects for the future.