Vanguard S&P is fine. Read the Bogleheads wiki, but paying anything to an advisor is not necessary. Just sell some of your insurance company stock, if no penalty and buy more Vanguard total market index funds, s&p is fine, as is VTI. Viala, diversified.
Balanced sector mix is mumbo jumbo. The S and P covers enough sectors of stock types. At your stage, you dont need bonds, but maybe 10% bonds, 5-10% international, is not horrible to get you in the habit of thinking about those areas and to see how they perform relative to us stocks over time.