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if you go to the 1st save section then hit the up arrow twice it'll show you the auto saves, which happen everytime you have a choice

if you scroll back/page up on your mouse it should take you back to the last option so make sure your cursor is positioned right where the last one was then scroll back/page up

Almost all of the endings end with you having to go on stage and make a speech(except for the special ends,  which you can check the requirements for in the endings sections in the extras screen). The endings are almost solely based on your reputation with each house. For each character you have to build your reputation with each house throughout the playthrough , and once you have enough reputation with a house you can choose that house's leader during the speech scene and that house will prevent you from dying after. Here is the endings guide if you need further info: https://steamcommunity.com/sharedfiles/filedetails/?id=1857222954