Collect as much blessings, and maximize your path buff as much as possible. Make sure the first boss gives you the elemental weakness you need. It will make your run longer, but it may help you clear.
It depends. For dps it’s recommended they get lv 80 and get their traces. Others can be lv 70 to unlock their a6 trace. 75 to 80 costs so much, so I usually leave mine at 75z