Is Umrah accepted after visiting a sorcerer if prayer is not accepted for forty days?

It is not permissible to consult sorcerers due to their disbelief (kufr), and the prohibition becomes even more severe if the sorcerer claims knowledge of the unseen. If someone consults a soothsayer and asks him about something, his prayer will not be accepted for forty nights. And if someone consults a diviner (kahin) and believes what he says, his prayer will not be accepted for forty nights. The non-acceptance of prayer does not mean its invalidity, but rather a denial of pleasure and reward for it. Your 'Umrah is valid as long as you have repented to Allah for what you have done, because one who repents from a sin is like one who has no sin.