Dont sell everything,just sell if its important. Or just sell half of all your bitcoin and the other half will be use in the near future.
This is also a good way though because holding all your bitcoin would not be good on bitcoins ecosystem and thats why we need to spend some of it to contribute on the circulation, As of now bitcoins price started to rise and its a good time to sell your some coins on the price point especially to those who bought on - $600 price.
In the past 7 years, it showed that if you hold the bitcoins long enough, you are able to make good profits.