For what it's worth, here's my plan. I have no where near the amount you have, but my plan is to keep the same asset allocation at whatever level of assets I have. If I had $1 million or if I had $10 million, I would invest similarly. I'm told at levels above $10 million then tax considerations may start to dominate and I will need professional (tax planning, not financial planning) help.
Otherwise, I like three fund portfolios. Vanguard Total Stock Market, Vanguard International Stock and Vanguard Total Bond Market. I like 70% equity and 50/50 international, so I put 35% in each of the two equity funds and 30% in fixed income. Bond rates are so low, I'm hedging slightly with only 15% in total bond market, and 15% in CDs. I don't expect this tweak in fixed income will make much difference, but it helps me ignore all the financial news about predicting rising interest rates.