What is the reason no one has proposed to marry me, even though I am religious and of good character, while those who are not committed get married? And does the sorcery that afflicted my sister affect my marriage and the marriages of my other sisters?

Marriage and divorce occur by Allah's decree and destiny. Allah is the Creator and Ordainer of all things. A Muslim should strive to implement the means that Allah loves and avoid what He dislikes, knowing that the outcomes are solely in Allah's hands. Among the greatest means for facilitating marriage and other matters are piety (taqwa), frequent remembrance of Allah, and persistent supplication (dua), especially during times when prayers are answered. Magic may affect the delay of marriage, and it is recommended to perform legal ruqyah and seek help from trustworthy specialists among people of knowledge and religious commitment. It is not permissible to seek help from sorcerers and charlatans.