I'm very panic today where I see the chart of the coinmarketcap which show in below. All the coins down approx 15 -20 percent whereas BTC and ETH are also very low. So what can I do where I buy BTC at $10k and ETH at $500 all you can do is wait for the market price to rise again. And even then, if you don't get panic, then sell it at a low price like this, and you really lose. Stay calm and monitor market price movements.