If you want to keep the house you're in, and liquidate enough assets to retire early, I'd consider the following: If the others are rentals, I'd chose one, move into it, fix it up over a two-year period and then sell it. You can keep $500k of your profit tax-free when you're married ($250k for singles).
Repeat every two years or until the tax law changes. When you're done with the process and have invested all the proceeds wisely, move back into the first house (which you've been renting out all this time, for positive cash flow, of course) and live happily ever after.
Make sure you check with your CPA. (Get a good one if you don't have one yet.) There are a few landmines you will want to avoid, but taking advantage of this tax loophole is a hugely mustachian thing to do.
P.S. If you go this route, do NOT pay the others off with the proceeds of the sold houses. Make those little green men work for you to create long-term wealth. You might also consider refinancing everything while you are still working if you don't have great rates on each property.