Check out BTCJam.com or BitLendingClub.com help out some of the smaller home miners that have loan requests on these sites, you can add some interest to whatever you loan out and let your BTC make more BTCs for you all while you help others in the crypto world. If I was in your position that's what I would be doing, I'd invest some, also keep some in a hardware wallet to see if the price goes up in the next year or 2. The rest would be put into a mining farm of my own, buy a bunch of SP31s and let those make more coins for me.
The nice thing about BTCs you can let them make more BTCs for you without much work.

Or hold out until the price per coin gets to a point where you feel comfortable and sell them, there's plenty of sites out there for this. But with that many if true I would always keep some through the ups and downs, just to see what happens. With Microsoft now in the BTC biz, and a lot of other companies helping bring BTC mainstream you never know what the price per coin will be in 6 months to a year.

I am always accepting tips https://www.changetip.com/tipme/RME