It's easier for me to do something every day than to do it just some days. For example, I find it easier to exercise when I exercise every day. If I try to do it just 3-4 times a week, I spend a lot of time arguing with myself about whether today is the day, or tomorrow, or the next day.
If I do something every day, I fall into a routine; and there's something about routine activity that makes me happy. It's true that novelty and challenge can bring happiness; but, the pleasure of doing the same thing, the same way, every day shouldn't be overlooked. Believe it or not, I find happiness in activities such as making the bed, sweeping the floor, and making the morning coffee. The things I do every day take on a certain beauty.
Andy Warhol said it best:
Either once only, or every day. If you do something once it's exciting, and if you do it every day it's exciting. But if you do it, say, twice or just almost every day, it's not good any more.
So if there's something that you wish you did more regularly, try doing it every day; and if you do something every day, revel in it.
One of my goals is to do one act of kindness each day so it becomes routine.