what difficulty of Clan Boss are you attempting? You've got some really good options already but it might be a Gear issue more than anything. Running Dragon Dungeon might be your best bet right now

I would like to run nightmare so I can start getting some books for my champs. I do like 4 to 6 million on the boss. I know its terrible. I feel like its my team comps. My gear on every one of my champs that I use is in no way matching sets but I have crit where i need crit and I use HH artifact optimizer. I just don't really understand the team part of the program. It always pulls up mostly rare champs that i don't really have any training into.

The team recommendation is just other teams people have used that have champs you have,

However, they often have utterly insane gear and stats on them. Those rares you're seeing in the suggested teams might well have 300+ speed and crit dam on them