I have no idea what to do i reached the castle 4 times already but each time after beating the endboss i go back in the past just do the entire thing over again this has been my fourth time and nothing is happening it sais break the patern 9r smt at the beginning but absolutly nothing happens
If you repeat the same steps as the first cycle, the same things will happen each time. The line about "break the cycle" is to encourage you to try different things, actions you weren't supposed to do before. If you're having trouble, try looking for the guides for the game - even if you don't want to use them, they'll get you on the right track.
I don't know if this link will work, but for example, here's a guide I can vouch for:
https://steamcommunity.com/sharedfiles/filedetails/?id=1396963463