In D&D you're not supposed to rest after every fight, casters are powerful and you should use their resources carefully. Resting should be limited.
Agreed.
I'm maining a wizard and I have only long-rested three times in about 15 hours of play time. It's actually a problem because I'm way behind on character interactions.
Cantrips are being underutilized. Also, eat food instead of casting all the cleric's heals. They should be used in an emergency. Let your characters go down and use Help instead.