What are the possible reasons for delayed marriage despite repeated proposals?

This matter is among God's written decrees, which He brings to pass upon His servants with His wisdom and mercy. Therefore, there is no need for your family to despair. Let them trust that God may divert from you something you desire and reserve for you something better than it. We advise you to maintain the prescribed adhkar (remembrances) and legitimate ruqyah (incantations) along with relying upon God and increasing in supplication.