The advice I give everyone else: Put your savings on automatic with money going into one to three broad market or total market index funds within a Vanguard, Schwab, or Fidelity account. (Fund examples include VTI or VFIAX.) Don’t ever sell. Celebrate when the market goes up because you’re richer. Celebrate when the market goes down because you’re buying on sale.
Of course, I wasn’t that smart with everything, but I was that smart with a lot of it, and it has worked out well. $650k is enough to start making its own money, so you’re in great shape. If you’re worried about investing all of it at once and possibly having it drop in value (temporarily), put it all in a money market fund as noted above, and make your 5% on it right now, and then every month roll $10,000 into VTI or VFIAX, or $50,000 every month. Do that for a little over a year, and then you’re invested.
Don’t pay an advisor unless you need someone to talk you out of selling when the market goes down. A friend just recently found a 0.5% fee advisor through Fidelity, so if you must have an advisor, it looks like you can do that for a lot less than 1.5%. Or find a fee-only advisor and have a conversation with them once a year. A knowledgable advisor can good to bounce ideas off. (I’ve had a couple of conversations with a guy through my former employer’s 401k.)
Good luck!