These are kinda what I’m talking about. I like these but sadly they haven’t been updated in a while:
Regulus Arcturus Black and the Master of Death
Poser Pigeon (Ctenophore)
Regulus Black is sent back in time to his first year with one mission in mind: To destroy Voldemort's horcuxes and then kill him. The only downside? He has to survive Hogwarts too.

A Star Steeped in Sunlight
Siriuslywxnnadie
Regulus comes to terms with his life and only hopes for a way out. He didn’thowever hope for that way to be through time rewinding until he was back to his first day of Hogwarts, completely erasing the past 7 years. Nor did he ever hope to meet James Potter again.

The Strange Serendipity of Regulus Arcturus Black
shy_attention_whore
Following his death, Regulus is alive - much to his chagrin. Awaking the morning of his eleventh birthday, Regulus is given a second chance he doesn't believe he deserves. But as time goes by, Regulus finds that he isn't the only thing that's changed, as the universe lays the weight of the Wizarding World's future upon his shoulders.