Before I invested my money in any cryptocurrency, I took a look at the historic price chart, I saw that BTC had a very volatile history, so I knew how it could go. I only invested money I was willing to lose and I bought at many different moments. Most of the investments are still in high profit zone, some I bought in June are now in red. But I knew this could happen. I'm still buying some coins at this moment. I buy coins from the projects where I believe in. And like I said, I know this could be e very volatile ride... I don't sell these coins, even when it seems prices are going down, nope, I'm a holder, a long term investor, red days are buy opportunities to me! As long if you don't sell with losses, you didn't make any losses! Do your research and invest wisely what you're willing to lose!