hi! i know it's been a little over a week since you posted this but if you still need help
minor spoilers obv!
florence 4th ending: before meeting him, follow will through the forest and witness him with the skeletons, then after getting away from him, you can go meet florence. when he takes you to investigate magnolia's break in, interview her and you should now have the option to bring up will as a possible suspect. afterwards, finish talking to florence and rat will out, that should give you the ending
florence 6th ending: sleep with florence first and then jed, you'll get the ending once florence sees you at jed's house
jed 2nd ending: this ending is triggered by sleeping with jak FIRST, and then magnolia. afterwards, you can go talk to jed and you should get the second ending, if that doesn't work maybe sleep with jed first/sleep with jade inbetween jak and magnolia to get jed to catch jak in the act
jak vs dijon 5th ending: this one is a bit misleading in terms of it being under jak vs dijon, it's triggered by interacting with and befriending WILL first (before jak i think, but i did it without meeting jak at all) and then triggering bastard in the forest, which you have to call out for help during. will should come rescue you, and youll get the ending achievement.
if you have anything regarding florence's 1st and 5th endings and jak's second ending in exchange pls lmk im so lost trying to get them LOL