Cursed Energy Levels Around the World Drop by Ten Thousandfold, but Miwa Kasumi Remains Unchanged

I am Miwa Kasumi, and I have been reborn. I returned to a timeline before Sukuna was killed, when everyone was still alive. Damn it, what can I possibly do even if I go back in time with my meager strength? I still can't do anything... Hm? Wait! What do you mean cursed energy across the world has dropped by a factor of ten thousand, while mine has stayed the same? Kamo-senpai can only use Blood Manipulation three times at most? Todo-senpai gets winded after clapping twice? Kenjaku's full-power attack can't even damage a single strand of my hair, and Mahoraga is easily exorcised by New Shadow Style: One Sword! Special Grade Cursed Spirits are practically stray dogs on the roadside... Sukuna looks like a complete joke to me, too! It seems heaven has ordained that Miwa Kasumi will save the world. This time, I'll win back everything! Above heaven and below heaven, I alone reign supreme! The Miwa Dynasty begins today!