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How to find a good third-party, 401k management/advice service?
Any fee based financial adviser should be able to help you. I don't think you need to worry about finding a 401K specific adviser. I'm not even sure that's a thing. A good place to start is the National Association of Personal Financial Advisors. The reason I specifically mentioned a fee based adviser is that the free ones are working on sales commissions, which may influence them to give advice that is in their own best interest more than yours.