Whether you will start it on January 1st or already doing it, what is it that is going to make you a better person?
For me, I decided to limit my two biggest timesinks, namely, Youtube and Reddit. I started several days ago and won't wisit them at all before I pass all the exams. Before, they were often an excuse for me to spend time basically doing nothing. Time to change that. (And yet, I'm doing the dame thing right now with ~, but oh well, it doesn't have content anyway)