FERS Federal Fact Check - Maximizing Roth Gains in Retirement

I absolutely loved the episode on what you cannot do in the TSP. Naturally, it brought up other questions in my mind. Before I got smart in 2019 and started funneling all of my TSP contributions to Roth, I had designated contributions into Traditional TSP. What is a good strategy when I start withdrawing? Ideally, I'd like to withdraw traditional contributions first, then Roth contributions at a later time (so the Roth balance can continue to grow tax-free). But I don't believe I will have that option when I start withdrawing. What can I do?