Looking for some pointers on event

I'm currently at level 81 and really struggling on the third level of the winter event and doubt I am going to be able to complete it. Most of my gear is 2* and around level 76-78. What am I doing wrong? Do high level battles require continuously consuming cakes? I just am at a point I can not out heal the barrage of attacks. I feel like there is something I have to be missing about this game... Thanks in advance for any pointers!
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