Granted but the you that travelled to the past ceased to exist, so you never travelled to the past, and therefore couldn't change the past in the first place and the universe implodes because of the paradox.
You swim so fast you basically don't even get in the water, and end up skipping across it. Running into boats, islands, floating debris, and leaping dolphins is a huge problem.
You find music that you like, but the music that you like takes the form of a single song, which you then listen to so much that you no longer like it.
Your book is a global phenomenon, however, every book you write after it never comes close to being as good as it, so you are dubbed a one hit wonder, and resign yourself to a life of signing your bestseller in local libraries. You die of writer's cramp.
You stop spamming, and slowly, the once glorious active realm of Games and Arts dwindles down to nothing. The Games and Arts section is deleted forever by a boring future admin, as not enough people care for it anymore.