Taking Your Lumps
You don’t have to take just the RMD. You can take more any time. You can even take it all out in one lump sum. Of course, this will hit you with a heavy tax burden. If you were born before 1936, you can qualify for 10 year forward income averaging, but you have long since passed 70-1/2, so that reg is not really relevant.
Still, there can be advantages to taking a lump sum distribution. If you have significant other investments, and sufficient income from them for your living expenses, you can plug your lump sum into some of your other investments.
You might consider using it to set up an annuity that will give you a guaranteed income for many years, perhaps life, depending on the amount of your distribution. Now if you search the internet, you will find several articles telling you annuities are bad things. But being a lifelong contrarian, and speaking from personal experience and that of several friends who have annuities, I have found them excellent investments. Mine, after four years of taking monthly income from it, remains worth almost the original investment.
So even though the contribution age limit for a simple IRA is 70-1/2, you don’t have to end your investment activities.