There are many I guess but only if the market will cooperate. If the market will be more bearish than bullish for the entire year, any good coin cannot even give you that. But assuming that the market will be in its good shape for a year and its performance will also be good, I think you can have the top altcoins. x2 is not that big after all. You can have ETH, XRP, BNB, EOS, XLM, LTC, and other top coins. Even Bitcoin can give you that x2 target.
Of course, prices are not always stable but these two coins are always selected by many investors and do not take too long to wait. In addition, you can also look for some good projects to make profits faster but the risk will be very high.