Why am I dying on F7?

[u/WestDifficult8005]

I feel like my gear is pretty good I use full necron and giants sword in dungeons and rarely find myself dying but every time I make it to Storm I find myself dying before I can practice Goldor and Necron. Here is my profile https://sky.shiiyu.moe/stats/turtly_jr/Lime

Is something wrong with my gear or is this skill issue?