That’s a really difficult question. I don’t really know the answer to be honest. If I had to guess I would say that the key is being organized and organizing things in such a way that you can actually get them done. I am really good at intermittent productivity meaning that I don’t block things out in big chunks. Most people schedule their day in big blocks. They eat a meal, they go to the gym, they do their work, they spend time with family, whatever. I don't do that because I can't be productive in really big blocks. Instead, I focus on trying to get a lot done in really brief increments repeated at times throughout the day.
Perhaps some of this is due to being self employed, but I really break up my day. I try not to spend more than 30 minutes straight on anything. That way I can really focus on one thing for a really productive bit of time without burning out on it. To make a bad analogy, I’d rather do 100 pushups in 10 different segments across 10 different 10 minute periods during the day than spend an hour doing a dedicated workout in which I try to do all of the pushups. The reason this works better is because it's hard to find a full hour in the day. But anyone can find 10 minutes. Yeah, maybe you won't get the same equivalent workout in, but you'll work out MORE CONSISTENTLY.
That just works better for me. Not sure if would work for everyone, but intermittent productivity is what keeps me focused and helps me get lots of little things done in a little bit of time adding up to a lot done over a lot of time.
Good luck in 2017!