My guess is that there are going to be two arguably "good ending" timelines:
1.Getting all socialist government and negotiate a ceasefire with the central power as the Menshevik
2.Conducting a successful Kerensky offensive at Caucasus front and knocking the Ottoman empire out of the War as the SR
but I have a strong feeling that the second timeline will also be actually bad somehow, leading to something like Kerensky dictatorship while the country still irreversibly breaking down