So let’s review. The MC’s main regrets before dying his first time was that his village was razed by demons and his lover was killed. He has just killed the person who did both of those things, meaning that there is no threat to either.
Where the hell do we go now? Unless the MC pulls something out of his ass like “oh hey, I also have this regret I want to use my future knowledge for”, he has reached the ultimate good ending. What conflicts are left?