To earn profit 100% in 2 month can be possible but depend on the your strategies and lucky. Alot of altcoin has potential to raise 100% because the price oversold, i think just buy in this bottom and wait for 2 month so big probabilitas you will make it. The altcoin that still in the bottom with good team developer is OMG, ZRX.
It will be a another gamble for OP, he needs to grow his capital and with your suggestion it might lead him another failure if his capital wont be double in 2 months, that is why he needs to do some trade to have an everyday profit. He only needs to have a good luck and a good coin to have a good profit in trading.
The first is not gambling, so don't rely on luck to pick coins. and to get a 2-fold profit in 2 months is not a difficult thing in trading, even many traders can profit with that amount in just a few trade times,
of course the market conditions also affect, you have to be more patient right now, choose the right coin for trading dude!