forgiveness is only accepted by Hashem when the person really means from deep in his heart that he is mochel his friend. we all know the famous saying “words are nothing” forgiveness needs to come with feeling & sincerity. a person cannot just read the al chaits on yom kippur flying through them & then just assume that hashem forgives for everything on the entire list. he needs to have charata to never do it again, in order for his teshuva to be accepted.
open up a sefer shaarei teshuva from Rabeinu Yona to see the complete steps of teshuva for trshuva to be fully accepted & forgiven.
Have a ksiva v’chasima tova