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You can have it all with one brokerage in one fund and still be diversified. Suggest reading up on the 3 fund portfolio or boggle head.
S&P 500 is top 500 US companies. Many folks consider that diverse. You can also probably find a US Total Market fund. That will be even more diverse as it will include small and mid size companies in addition to the top 500.
Alternatively, even more diverse would be a Total Market fund. These typically include international companies, and represent the biggest diversification you can get.
No need to worry about Vanguard versus Schwab . The underlying stocks of the fund is what matters.
They are restricted. California has an insurance commissioner who has to approve any rate increases. It’s probably easier to stop insuring then to get the rates up to the profitability margin their risk models are suggesting are appropriate.