the market is red, all falling, time to panic sell ! oh hell no, be careful with your investment, remember that if you sell you lose. If you buy at low price, you will made a median price, its better to buy more at the bottom, so when it comes back again, and suddenly will, you recover your money faster.
Thas why is good to have some usdt just waiting for a oportunity.
But i need to say, this worth more for coins that we know that have space in the market not for some random coins.
Always do risk manangement.