Is there a way to free your body from the hormone progestin or at least reduce the level of it?

For sure not!: 'progestin' is a large family of both natural and synthetic hormones whose actions are called progestational. Progesterone is the important natural hormone. No, you cannot be free of it and don't want to be - cortisol is made from progesterone, and you'd literally die without it. If you refer to progestin supplements, there are no life and death problems with reducing or discontinuing it.