Ok, so I have £1500.

I am 17 years old. I want to make money...
I have three weeks of summer left to do it.
I know that buying and holding Bitcoin is almost guaranteed to make me money in the long run but, I need more money than I already have.

How do I get 10x returns in three weeks?
Altcoins? ICO? Buy a Bitcoin ATM? Create a cryptocurrency myself?

Thanks