Can You Dominate the World by Completing System Tasks?

My predecessor was so happy, I came to inherit everything from him, but who knew that this body's spiritual roots were broken and its cultivation was completely ruined... Other time-travelers go to the fantasy world, are crazy cool, and are full of magic weapons and secrets to conquer the heavens. How about me, you ask? With a broken home at the beginning, I can only listen to music every day. I don't want to be a coward, but my family members want to kill me. After a long time, the system assigned a task, and I was actually asked to find my grandfather's relics? Fortunately, after finishing the game, I became invincible. Beauty? Opportunity? It's all mine... Steal from me? Then I will kill you first to seize the treasure. [Congratulations to the host, you can get extraordinary rewards by completing the system's tasks] I want to have all the other time-travelers in this life. I don't seek to arbitrate for eternity, but only seek to suppress the heavens.