Might need the money in 5-7 years time for housing. I'm thinking about Lump Sum 40% and proceed to DCA the rest over the span of 5 years into QQQ. However, I am quite uncertain about how safe this is due to not experiencing any market crashes. Can anyone with experiences please let me know what I can do with this sum of money so I'm able to double it or more in the next 5 years rather safely.