Yes, outstanding advice all the way around. Here are some other things I'd add or reinforce.
- I'd move the Bettermint back to Vanguard. Fees at this level of investment dollars just cost a lot.
- If you're charitably inclined, consider opening a Donor Advised Fund the same year as the sale and put aside some of your future donations today when you get the windfall.
- You'll have around $2.75mil in investments, continued employment, and another bite at a sale. Unless your spending habits are in excess of $100,000/year, you already have enough money to live on for the rest of your life. This isn't traditional advice on here, but I would consider taking a small portion of your portfolio for some alternate investments.
I'm not talking about a hedge fund. I'd establish a family limited partnership and start investing through it. Examples of stuff I'd do:
Buy a low-maintenance townhouse free and clear and use a property management company.
Do some angel investing in a similar field to your experience
Participate in putting up some equity for a commercial real estate transaction
Buy some land in the country that just had the timber cut off of it for the cheap. In 20 years you'll get a big check and still own the land.
Consider these your "moonshots" that not everyone can do and you may earn higher than market returns because of the league you can invest in. Just don't get greedy and start playing with your core $2mil portfolio.