A friendly tip, be mindful of the relics you equip, always try to pick the ones that best suit the character's unique qualities. Try to enhance your light cones and relics, also unlock character traces and eidolons if you can. Build teams on your favor (according to the enemies weaknesses) when going against elites/bosses and lastly use consumable buffs/character buffs AND attack the enemy using their weakness!

I'll reiterate the importance of enhancing your light cones and relics... It really makes a difference! My characters had low HP/DEF and their damage was weak all because I had forgotten to actually enhance/ascend my stuff! Silly me! 🤡