I have invested in cryptos in one of the most inapropriate times: December. Luckily not all the money. I bought something in March also, but haven't took any profit out yet. I had over 100% revenue on a good trade with ETC a few weeks ago, but I reinvested the money. Now I think that I should have took some profits out. I believe in hodling up to some point. When you feel comfortable with your profit you should take it out. That's my opinion. There's nothing nailed in crypto so next time I get my hands on some ATHs I will sell everything no doubt and get my profit out of the market. Then I will reimvest when dissapointment will take over the market again. I have to say that I learned about crypto markets the hard and painful way.