Is there a reason why there are no high level enemies in the game at the end besides bosses? It's hard to get up to Level 99 or am I missing something?

I think this was mentioned before and I think these were the nominations...

Henne mines special area
Lhusu mines special area
Pharos subterra
Giruvegan Great Crystal

Somebody posted about Nabreus Deadlands and Necrohol of Nabudis but those enemies are much weaker, not sure why they posted that.

I'm at level 59-60 right now(Yay!) For levelling up to level 67, are those the best places? Is there anything I should know as well?