What Can A Msulim Do Now For His Passed Away Father?
Sorry for your loss. May God grant him Jannah. You should do the good acts of Deen and ehtics. Of course, your father had been training you to do good, every good act of yours, its reward will go to him too, Insha Allah. If he has willed about some charity or if he used to do some charity, you can cantinue it to make it Sadqa e Jariah. You should do good to his relatives he used to care about. It will make him happy when it will come to his knowledge in the hereafter. You can keep praying to God for his forgiveness and high status in the afterlife.