How can you get the most out of your day?

Lately I’ve been goal oriented and I want to make the most days. Some are better than others, but if I’m not on vacation, then I don’t really want to “waste” days which I feel is unproductive. Does anyone have tips on how to make the most of your days?

Does it help to write down small goals in a journal, or keep a calender filled with activities ?

Do you exercise or meditate in the morning and find it helps your day run smoother?

I’m writing this because I’ve been depressed, and the days which I am, I just sit around, eat, and not really do anything. When I look back, it seems like a waste of time. I know that it’s necessary that happiness is not 365 days a year, but how can I make sure each day can be as productive as it can be ?