I did the regret exercise and at present I can only think of one thing that I currently regret that I haven't dealt with as I would like and that is "not marketing my books enough" (I'm self-published because I like the controllability self-publishing offers so I am responsible for how much marketing is done with my books)

How will I begin working on it? I'll get to know more authors and work on developing working relationships with them through joint ventures like blog post exchanges.