Does someone has any suggestions how to make 17 BTC with 7 BTC starting capital in short period of time?
Try Forex bro, only forex can grow your btc significant but don't forget that forex also can deplete your btc in short time.
High Risk = High Money = High Loss
Forex is good but that is not that easy at all. But I saw someone is offering a forex service where he is going to be your advisor and will be responsible with your account.
That 7 bitcoin can grow up to 17 bitcoin or even higher but in forex it depends on how you are going to be good with it.
You can also do trading at the same time.