I switched some coins to BTC, LTC and USDT. I closed some postiions partly at loss, but I feel much better now, especially the volatility is better. As long as you still feel comfortable I wouldn't close at a loss, but for me it was not the right thing because bitcoin were less than 5% of my portfolio. I still have all of the altcoins, but a much smaller amount. I think that guys' advice in this thread helped me a lot!