Bitcoin price is at $1152 Dollars per 1 bitcoin this means that altcoins will be increase it price too where many people will be happy on what the bitcoin price at now. For me the best profitable in bitcoin is i'ts alternative coin where we can get really profit into it. And we can minimize our loses. Better to hold them till the bitcoin price hit 2000
If the price of altcoin does not increase, it is better to sell them into bitcoin.
I don't think it's actually easy to determine the price of altcoin because if you take the case of eth it was around or below 10$ for 4-6 months and now if you see the price quickly rose up to 13$+ this was just the case of eth if you see litecoin or doge from what I feel it is best to use your strategy because for now they literally seem dead to me.
It seems that you need to find the good altcoin and then make a lot of money.