Awesome. You passed the first retirement Milestone.
If you are married (or you get married) you need to fill out the Bridge Option form with the Retirement Agency and turn it in to them! (possible via interoffice mail, but preferred for something this important is hand-delivery - by you!)
That's it. Keep doing what you do. Keep investing as you have been. Be safe.
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If you want to choose to save and invest even more, you can do that in a regular brokerage account. Vanguard is one good option.
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Consider talking to Freddy Rappina, a retired Fairfax County Police Officer, who understands our system's quirks and features. He is a fiduciary, he puts your needs first, and he has the education and training to help you. Plus he's a really good guy.