Sudharma is called Personal dharma here; some editions use the English label Apt religion. Here, the theme is a way of living or practicing that you can sincerely take part in. It may concern a religious commitment, but it can also open a question about whether a chosen discipline fits your values and circumstances.
The arrow leads from 28 to 50, the Plane of austerity. The connection suggests that a practice you understand and choose can make sustained effort more meaningful. It does not make effort automatically easy or establish one path as right for everyone.
Consider a practice you follow. What do you understand about its purpose? What is yours to choose, and what are you continuing mainly because it is expected?