Question, should I update a story? And which one, I'm getting kinda bored and I need motivation, please help.

As you can tell from my  username I love hetalia. Of course I do have many other shows that I enjoy, including: Sherlock, Hannibal, Supernatural, Welcome to Hell, MLP, Assassination Classroom, FNAF, FNAF Sister Location, a bit of Doctor Who, ect.
    I do love many different shows and movies but if I tried to write them all down, we would be here all day! 
  I love to draw and paint, writing though, is not my specialty and even if I did get around to writing a story or two, I get distracted far to easily for me to finish. 

I was thinking about making a hetalia, Creepypasta, human!FNAF or Assassination Classroom,Zombie Apocalypse story, what do you think? Let me know if you have any ideas!