Atm I am Stuck at story. I did all my gates and replay missions for the day. That means I cannot play the game anymore until tomorrow if I do not spend material on getting new keys? Pay to play play?
might just be a skill issue. I beat multiple levels even Igris with a lower power level than what's recommended. Just pick the weapons the boss is weak against and dodge.
To make the best use of crit use your stat points on strength while keeping your precision at 80% coupling that with crit rate and crit damage will give you extremely high damage but you have to master the use of extreme evasion.