Well the replies in this thread are kinda the same and most are telling you you can't double it SAFELY, double yes safely no I agree with this. Now if you are willing to take risks you could invest after doing research but you would probably want help of a professional as well if it's about this big of a sum
there are actually safe ways of doubling it, you can invest it into bitcoins and then just wait a long time, sooner or later it will happen
The problem is how long it will take and remember there is no warranty that bitcoin can crash tomorrow.
A safer way to do it may be investing in alternatives that not easily fall in price, such as gold.
However, as far as I know, bitcoin can be more favorable than gold sometimes, in terms of potential for earnings.
I think so. The good coin to invest a few months ago was the Monero and Ethereum. But their prices have risen a lot.
Both of those are good altcoins to buy and hold as the pumps are happening along the days, even with the high new values of each one.