Reborn 80000 years

The God of Cosmos was framed and persecuted after he failed in the competition over the crown of the lord. No one would expect he could come back to life 80 thousand years later. This time his soul was accidentally bound with Yang Chen, the son of a servant. Unfortunately, Yang Chen, the original body owner, was the worst at cultivation. How could the God of Cosmos start his revenge planned for 80 millenniums? The answer is, of course, cultivation!