That's a really big money to invest.
If you have the knowledge and knack for investing in cryptos then you should go for it, do trading instead for long term hodl. Many individuals such as me doesn't really have much so we cannot go into trading, and so we only participate in bounty campaigns. News has it that trading can give a lot of profits.

Or you can combine long term hodling and trading. This also works great for some people I know.

On the other hand, mining could be a great alternative. However, it is no simple task but you can always pull together capable hands.
And you can also consider investing in mining farms.