It is hard to say, but perhaps, you can choose the top 10 - the top 100 coin list. By analyzing for all of those coins, I think you can get more than 10 altcoins, which can increase in 1 year. But still, that will be difficult to predict which coin can increase because I think all of the altcoins will have the same opportunity, and that will depend on every project of the coin.

But perhaps, I can suggest you use bitcoin to hold for 1 year or more because the only bitcoin which I can see that will give you 2x profit or even more. We don't know what will happen with the altcoin because when bitcoin moves, the altcoin will follow. So be careful when you want to hold the altcoin. Many people now still waiting for the time to the altcoin to increase, and that is why they still buying more altcoin amounts if the price is down because they already buy the altcoin at a higher price.