Here's how I did it- so you need to see all of the girls scenes when you write a poem for them, which is impossible BUT if you're in the middle of writing the poems in-game you can save, then you focus on one girl at a time - also make sure when Sayori confesses to you at one point say that 'you love her' to get the Sayori hugging scene, then when you move onto the other girls - make sure you choose them specifically for the festival on which one you're focusing on, also when you're in act 4 (Just Monika) make sure not to delete her too early or you'll get the normal ending - I deleted her at the line 'Welcome to the literature club.' then when you delete her - enjoy a different chat with Sayori and be sure to read the Creators' note. If you have trouble then please reply and i'll try and make it clear if you are attempting the good ending.