What do you do when everyone who proposes to you backs out after learning that your father drinks alcohol?

The Prophet, peace and blessings be upon him, advised to seek the religious woman. Therefore, this advice should not be disregarded in the case of a righteous and religious girl whose family is not. Rather, it is more befitting to marry her to save her from the temptation of her family.

The presence of a disobedient father does not prevent marriage to his righteous daughter. Indeed, the Prophet, peace and blessings be upon him, married the Mothers of the Believers, some of whose families were polytheists.

This marriage might be a reason for the father's guidance. It is not necessary to inform the suitor about your father drinking alcohol. If the father is open about it, the suitor will know. If he conceals it, then it is not permissible for you to expose him.