Also you say that you only have 4 Endings and are considering doing a NG+ already, but what Day is it? If it's already near Day 50 then that's fine, especially if you finish it off on Day 50 with an Ending that only lets you do a NG+ that must be obtained within 50 days. Otherwise you should try to unlock as many Endings as you can per run to maximise the time spent per NG+ run.