About 5 years ago the price went down from $1000 to $250, see where it is today. So what? As you can see it's not because the Bitcoin price goes down to 70% that it means the party is over. Bitcoin started to be mainstream only 2 or 3 years back maybe and the project is 10 years old. So give it time and have patience
Some people are just that dense they see nothing else but the price of bitcoin as a measure stick of its health when that should not be the case, you just need to look at the technology and the development behind it to know that bitcoin is still as good as it was before, nothing has changed except the price so it is clear that at some point in the future the price will recover and go even higher.