How can one achieve sincere repentance from the recurring sin of adultery, a repentance from which there is no return, and is there an expiation for that, and will this repentance be accepted without the implementation of a hadd punishment?

We advise you to seek refuge with Allah, repent sincerely, and increase in good deeds. Conceal yourself and do not disclose your sin to anyone. Appreciate the gravity of this sin and the great reward of those who are chaste. Remember the worldly and otherworldly dangers of fornication. Appreciate the danger of corrupting the morals of the woman and her family, and do for them what you would like them to do for you. Seek help from Allah Almighty and supplicate to Him to grant you chastity. Be keen to stay away from this woman and do not be alone with her. Avoid places where she is present. Increase in the remembrance of Allah, marry what will keep you chaste from the unlawful, and fast often. Be mindful of Allah Almighty's constant observation, maintain congregational prayers, and perform abundant supererogatory acts of worship. Read books of encouragement and warning, adhere to righteous environments, avoid consuming aphrodisiacs, engage in sports, and occupy your time with acquiring beneficial knowledge.