When Immortal Ascension Fails Time Travel to Try Again

What is my 1000-year-old monster self to do when I've failed my immortal ascension? Time travel accidentally and wind up back in my 9-year-old body, needing to re-cultivate, of course. But after that? Get REVENGE! Muahahahaha! But the idiot who killed me also accidentally was the main character of the dumb harem Xianxia I transmigrated into. But wait. Wasn't he only 7 or 8 at this point in time? Well, since I can't harm a child or the main character without suffering in some way, then I'll just have to raise him better, faster, stronger, and loyal! Muahahahaha!