1. Be patient, don't panic.
2. Buy and hold.
The first attitude is very suitable to be applied and very many traders experience tremendous panic when they see the market price drop, especially Bitcoin is now at $18k.
It's becoming increasingly apparent that other coins are very influential on Bitcoin. So, the opportunity to buy to increase the volume of Bitcoin can be done again for long-term investments. The current market situation in my opinion is a very tough test to be applied by those who are impatient.
Do not panic. Everything will get better.
Actually OP, it is easier said than done. Given that there are people who invested thousands to millions of $$$ on their BTC investment, this means that the slightest movement on its price could mean an increase/decrease of over thousands of dollars on their investment. So, while the thought of HODLing and hope may give some sort of assurance, people who have lots of dollars on their investment should be ready to take all the contingencies and plans in order to maximize the their gain or loss on their investments.