To follow on to GoodGuy comments.
If you check out
firecalc and plug in your 800K portfolio with 55% stock/45% equities mix you'll find that you have a 100% chance of being able to withdraw an additional 19K and adjust for inflation for the next 30 years. In fact, you should be able to withdraw up to $30K safely. Another way of looking at the situation is that your initial nest egg of $500K was adequate to support a $19K withdrawal. You were fortunate to retire during bull market, unlike I who retired near the top of the dot.com bubble.
I'd encourage you to play around with this retirement calculator, and don't sweat that your retirement budget isn't exactly what you planned. Now if you really need 50K a year more that is a different story.
One piece of critical data is your age before we give your more advice.
What you say about financial planners is sadly true, once you are retired you can't earn back your losses and they don't really understand that.