Self employed

I have been doing my darndest to make sure I owe as little as possible this coming year, keeping close track of expenses and travel done for this seminarian work (and less as an Author, I travel less as an Author) as, as filed by those who pay me, I am a self-employed independent contractor, so I have been keeping track of my milage and any meal expenses or resource expenses for the sake of my duties (educating, learning, forming others). I do not know everything I can do to minimize owing beyond what I am already doing.