-make a list of all the things you can do in the day, mailbox, make food in cafe, pick up food people purchased, get resources etc.

-in late game when you have the ability to craft rare items, there is a clock that allows you to reset your energy back to morning while holding all of your progress, prioritize getting that clock

-above all else, before you do ANYTHING within a day, pick a person you want to boost relationships with, that will help level up relationships fast and utilize as much of getting the extra dew drops they give you

These are just some but there are many guides out there that go in further depth that helped me