Everyone who's saying that 2018 will give better gains than 2017 is lying.
In January 2017 you could've put a blindfold on yourself, randomly picked a coin to invest $10.000 in and there was 95% chance you'd be close to a millionaire - at least.
This will definitely not going to happen in 2018. Bitcoin won't gain 10-20x like in 2017. Not a chance.

2018 is the year we're going to break 1 trillion.
But, it's also the year the bubble will pop. And I'm not talking about Bitcoin bubble, I'm talking about the shitcoin bubble. There's too much shit out there that will burst and that money put into the promising projects.
2018 will also be the year when governments start cracking down hard on crypto. This will also be the year of privacy coins.
2019 will be the year of tech coins and 2020-22 is the year a lot of tech altcoins will be implemented and accepted in the real world and we will break 10 trillion market cap.