You could edit savefiles or cheat, but if pure legit, you have to do it again.

My choice was doing it on steel soul 100% anbd speed completion, as well as neglect, you get efficient with achievement and runs.

In the case of two different achievements you get from choices (Banishment vs Ritual, Rivarly vs Neglect, and Purity vs Happy Couple) either you play the game twice, or you duplicate a savegame just before making the choice. Then, you go one choice in one savegame and the other choice in the other savegame.
If you already completed the ritual, and you don't want to edit the savefile, I cane leave a link with savegames, you just create a new savegame and replace the new savegame with one of this files.
In this drive[drive.google.com] you'll find folders with savegames. I don't think neither Ritual nor Banishment is complete in any of them, but I have no idea how advanced they are.
And in this guide made by [R]ezno you'll find (among many other helpfull things) what to do with the savegames.
Remember, either you want to edit your savefile or you want to create a new save with another file, make a backup of your own main savefile, just in case anything goes wrong.