You can try this Double in a Day Forex Strategy on your demo account first. The crux of this strategy is to use a 100 pips move to double your account in around 1 day. You can read a detailed analysis of a double in day forex strategy trade in this post that explains a GBPUSD trade that doubled the account in 24 hours.
You can read another post here which explains a double in day forex strategy trade that made a gain of 80% in 24 hours trading EURUSD pair.
You can read another post here which explains a double in day forex strategy trade that made a gain of 80% in 24 hours trading EURUSD pair.