With a large amount of money like that, why not try to invest in any business-related, and if you are knowledgeable in using the cryptocurrency why not try to invest in different coins, but I prefer to use just one currency some of the altcoins do not have reasonable price nowadays. One of the cryptos I can suggest is Bitcoin. It is one of the most stable coins for the whole month, and if you want to try too is the BCH those coins are today.
The price of the ethereum now is not stable from the previous weeks. The amount of it goes down, and it retakes time. But no one knows it depends on the market. There is a possibility that the ethereum rises before the next month comes.