Use it to your advantage and purchase more. It's better to buy while down than while it's up.
The only day the stock market is important to you is the day you decide to cash out. The rest of the time, the roller coaster ride is just background noise. I've got a while to go before I even consider an exit. When that day comes, the market could be super low or super high. I can't predict. But since that day is not today, it doesn't matter to me. Although it may matter to some others. If it does to you, I sympathize for you.