I would never invest in a coin for 10 million dollars, I wouldn't even invest all in cryptocurrency.
I would try to invest into tens of different stuff as much as I can and never put all into just one thing, not coin not stock not business nothing, I would diversify mad and I would find business' buildings, cryptocurrencies (not just bitcoin and ethereum) and mainly stocks and bank savings account for some of it as well just to keep it safe.

If you want to put all of your money into one thing that means you are not good with your money and it suits someone else that knows what they are doing so good riddance mate. In some sense, bitcoin must be a good choice for those people who are depending on others for their decisions.