How can one repent of sins and transgressions, including kissing and touching foreign women, and is repentance sufficient to prevent its repercussions from affecting one's family?

Your heart is nourished by faith and hypocrisy. The heart of a believer is like a radiant lamp, while the heart of a hypocrite is a vessel for pus and blood. Therefore, you must strengthen the substance of faith in your heart, sever your relationships with non-mahram women, repent to Allah, and increase your good deeds and night prayers. Sincere repentance erases sins.