It's not easy, such profit is usually made with high-risk operations, like trading/holding altcoins.
so true. it will not be easy. there are so many ways to change the 2 to 4 BTC BTC, but I guess you're right. it wants to have a very high risk, even if you're investing or trading, it will always have a higher risk. I guess you will not be able to make it 4 BTC if you did was hold bitcoin, and bitcoin expect prices down so that you can afford. the only way you have to pass is to take a high risk