this is how i imagine my wife aira

I played Clair Obscur Expedition 33 in July and I stopped. I'm about 9 hours into my save game. I forgot everything and got destroyed by the ennemies. I don't want to start all over again.
I'm facing a boss named Lampmaster who has a phase 2.
Everyone talks about Maelle, but she only does crappy weak attacks.
Gustave is only useful for overcharging. Lune is useful from time to time.
Sciel seems to be strong, when I lose my first team and she comes in as reinforcement, she does a lot of damage with her cards I noticed but it seems too complicated. She's a character for people who have more than 100 IQ.

How to do big damage without parrying?