The factors that lead to dry heels and cracks are many, but prevention can help you avoid them.
Frequent foot care is the most important way to keep your heels soft. Do not forget to rub them with a rasp, file, or pumice stone at the end of the bath to remove dead cells and calluses. For better results, use a scrub and rub your soles regularly.
To protect the area, you can also cover your heels with special covers to avoid irritation and calluses while doing your chores.

In any case, consult your doctor.