How can there be a correct and comprehensive repentance for all these sins, and what should be done with money acquired through illicit means, and is seeking forgiveness along with returning rights to their owners sufficient for the forgiveness of sins, and why did the companions of the Messenger only seek forgiveness without the need to cut off communication with them?

Your realization of the gravity of sins is the beginning of the right path. No matter how great the sins, Allah's forgiveness is greater and His mercy is vaster, and He loves those who repent. Repent to Allah and do not despair of His mercy, for the door of repentance is open to everyone who has wronged themselves, even if the sins were shirk (definition) (polytheism), kufr (disbelief), murder, or adultery. Repentance does not require special rituals; rather, it is between you and your Lord by fulfilling its sincere conditions. Ask your father for forgiveness for your disobedience, return financial rights to their owners, and get rid of ill-gotten wealth by spending it on the poor. Increase your supplications for the man and his daughter. Have a good opinion of your Lord, and remember the story of the one who killed ninety-nine souls, and Allah accepted his repentance, and the story of the three who lagged behind from the Battle of Tabuk, for the one who repents from a sin is like one who has no sin. Absolutely beware of suicide, for it is not a solution but a transition to greater misery.