Breaking Free of the Cocoon O Reborn Itadori

I haven't read the manga, just watched the first two seasons of the anime, but I know what happens afterward. The story is too tragic, so I had a little idea: What if Itadori died after the Shibuya Incident, then traveled back in time to when he'd just swallowed the finger and been brought back to Jujutsu High? By then, he'd have learned Reverse Cursed Technique, slashing (is that what it's called? I don't quite remember. Is that the old guy's technique?), and Choso's Piercing Blood (he is his big brother, after all, so let's borrow that). Could he manage to get a happy ending?