1. Real estate investments can be very attractive due to access to cheap financing and tax benefits. Obviously there is risk (avoid those bubbles), but if you play it smart and find cash flow positive rental properties, you will probably net much better returns than the stock market.

2. As you get higher on the wealth ladder, finding tax savings starts to show good ROI. So you might want to hire an advisor or an accountant to help with that.

3. The standard advice for us normal folk is to have ~6 months of rainy day funds in a savings account. If you are in the 7 figures, you might want to map out some worst case scenarios to get a sense of how much risk tolerance you have and what you would need to 'survive' those bad scenarios. If I had moderate wealth, I would probably make sure I had a few years worth of living expenses stashed away somewhere. Also, I would probably have a nice mix of bonds, gold and other safe(ish) assets. This leads into #4

4. While I might keep a higher % in safer assets than I do now, I would probably try and balance that with some more riskier assets. At higher levels of wealth you have access to a much wider array of investment opportunities (lookup 'accredited investor'). For the most part, these investment classes suffer the same issues as actively managed funds (generally perform worse than the market, after fees. Look up 'average VC, PE, and hedge fund returns'). But the one advantage here is that, unlike index funds, you also have a (small) chance of hitting astronomical returns (ex: angel investor in a unicorn). So it could make sense to allocate a small portion of your portfolio to these types of investments. As mentioned, the average expected outcome is probably worse than just investing in index funds, but an index fund will never return 1000x where as there is a small chance that an angel investment might.

So the tldr is that there is nothing wrong with index funds, especially at the low 7's (and probably even into the 8's). But most people at those levels have much more complicated financial lives (own a business, have a bunch of real estate investments, need to worry about inheritances, etc..) that the standard advice about index funds becomes less suitable. For example, Warren Buffet, the champion of index funds, probably has the vast majority of his wealth locked up in BRK.

You're just a fatter whale.

Tax, liability and estate planning become more complicated. Also, at those scales, you can start taking risks someone with less capital would be imprudent to.