Kensington Park is tough, and it takes a long time to get through it. Since it's an optional area, you don't need to complete it. If you want to do the instance, you're probably going to need help from others.
That is surprising, I'm level 50 and have helped many beat it-doing majority of work (and ended up soloing it out of necessity at level 33). You may want to restructure your deck, get better treasure cards, find/buy better gear, a/o get more experienced level battlers to assist.
Most Times When I Can't Beat a Person is That My Deck didnt have his/her specialty's shield or my deck isn't Properly adjusted so that i get the cards I need at the time. So try to get rid of cards you don't need and Try to get four of your friends. I mean, I beat it at level 37 with a couple of my closest friends that have beaten it already. So Good luck!
I also have trouble with this dungeon i'm lvl 31 myth and cant do it. I got defeated at firegut the first time i tried. If you say this is easy you must be really good at the game. I always sell my treasure cards so maybe thats the problem?