i think you should hold on is already $8000 and here is the current price now $7791.98 so just watch out the similarity, because you can't predict how the system is going but for me if you are in need of cash you can sell to get your self back or you sell a little and reserve the rest to see the growth.
8000$ is just an number. Bitcoin reach that value thrice ,now the price may around 7791$ .It crossed already,If you had followed the price in any of website or application such as coin base ,you come to now that.Now due to the fluctuation the price was reduced to this value.
Tomorrow bitcoin crossed $ 8000, what's next? I don't understand what can it give? Everybody sell your coins? I don't believe it. All will continue to hold their coins and wait for price to exceed $ 9,000. This will continue indefinitely. So for me, no matter the price. I like any price which is above $ 1,000.