Wow! the truth is a lot of money at least for my haha, but for me currently one of the best investments are cryptocurrencies, personally I would invest in a masternode, I am not an expert but it would be my investment if I have that amount of money, one of the safest for example is Dash masternode, look this:
https://masternodes.online/currencies/DASH/
but there are many other interesting options such as smartcash and other projects that are very good (and of course I would invest something in steem of course :D).