First: No matter what you do, you must be efficient and efficient first. As long as you have high efficiency and good quality, you can naturally save yourself more time. Therefore, the first step you need to change is your work efficiency.
Second: Don't spend so much time doing unnecessary things. You think those things may not take much time, but you spent a little time this time and that time, so it's not a small sum in general. For example, you like playing mobile phones very much. From now on, you can play mobile phone less. Set yourself a small goal of playing with your mobile phone, such as how long you can only play with your mobile phone except returning messages a day. Moreover, the best time to play mobile phones is in some fragmentary time, such as waiting for the bus, queuing for dinner and so on. Focus on what you need to do the rest of the time!
Third: You can do anything you think is meaningful, so you can spend all your time on meaningful things. As long as you do what you think is meaningful, how much time you waste is worth it.