How Much Should I Convert?

We have converted a hundred, 20 thousand dollars per year for the last three years. In the past, i paid the taxes from money coming in from a benefit account. But that is almost used up. We have nine years before we have to take r mds. And at that age, our tax brackets pretty low. Shall we keep converting, maybe less per year than what we have been doing, or stop converting, or just pay the tax when collecting our emdes? So far we haven't needed to pull them any money, not at the retirement accounts,. but that might change if we start traveling over seas. Preciate your inputting ideas. Thanks.