I guess the biggest chance to make 3 btc into 4 in just 2 months is by joining a promising ICO. Maybe Wing DAO can make it fly.
Look at Potcoin and Pesobit they skyrocketed into many folds after their ICOs.
By the way it's 2 months already. What did you do with the money? Did you make 1 more btc from those 3?
People create threads and then just forget replying there back...
This is what I don't like about many OPs that they had been made with the intention of just increasing their post count and activity and nothing else...
If OP could come up and share his views and results of what did he manage to do with his coins, it would be really appreciating...