Are there signs that indicate the acceptance of a supplication and that a girl is one's destiny? And how can one recognize these signs?

What is known as a "love relationship" between young men and women is not sanctioned by Islamic law. However, if there is an inclination of the heart between a man and a woman, there is no harm as long as it does not lead to something forbidden or prevent an obligation. Marriage is the best remedy, as indicated by the hadith (definition): "We have not seen for two who love each other anything better than marriage." Praying for the facilitation of marriage to a specific woman is permissible, and the fulfillment of the request is up to Allah. Supplication is beneficial in all circumstances, according to the hadith: "There is no Muslim who supplicates with a supplication in which there is no sin or cutting off of kinship ties, but Allah will grant him one of three things: either He will hasten his supplication for him, or He will store it for him in the Hereafter, or He will avert from him an evil equivalent to it." If you are able to marry, then propose to the girl's guardians; otherwise, turn away from her and occupy your time with what benefits you.