What should I do about my dysfunctional family, characterized by constant disputes, some members abandoning prayer, and the presence of those who curse religion, knowing that this negatively affects my worship and studies?

It is advisable to maintain acts of worship and supererogatory prayers, and to supplicate for guidance for your family, because "for Allah to guide a single man through you is better for you than red camels." If you have advised them with wisdom and good counsel, then you have fulfilled your duty; for guidance is in the hand of Allah alone. Allah the Almighty says: "Indeed, you do not guide whom you like, but Allah guides whom He wills." It is also advisable to be gentle and not harsh in dealing with them.