I'm all in bitcoins right now, when the price of BTC is about to rise it is a good time to buy, but I think we will see more altcoin carnage before things change again.
But if I was going to buy now, I would go for altcoins that are around for years but lost most of their marketcaps. Ethereum and Litecoin, for example. Just look what happened with LTC price in the last BTC rally.
Good, but maybe you need to analyze the altcoin market because I see many altcoins are prepared to increase high. And if you can get the right altcoin to buy, I am sure you will get a profit in bitcoin. Maybe ethereum will be a good choice to buy as we can see now, the price is still not increasing too high so your chance will bigger in making a profit. Litecoin will increase at the right time, especially if the bull market arrives and I believe that litecoin can break the high price too. But that is up to you, and if you prefer with bitcoin, then you can hold tight your bitcoin until the price increases.