First of all congratulations. The great thing about being rich is that you only need to get rich once, then you need to preserve it.

I’ll focus my comment about things often overlooked:

Insurance. Medical, home, car, and umbrella insurance. KEEP GOOD MEDICAL INSURANCE.

Work hard on your privacy. People with deep pockets are juicy targets for lawsuits. Start an LLC (with a name not associated with you) and transfer things like real estate to it.

Investments: there are tax-free investments such as muni bonds. Invest in rental properties (under your llc). There’s no shame in sticking a bunch of money into an S&P 500 index fund. Capital gains are wonderful.

When you speak with an accountant, tell them specifically you’re interested in tax deferment and protection strategies.

For your children’s education: look into front-loading their 529 plans.

If your accountant doesn’t mention this type of stuff then find another.