If they get itchy for combat, use wandering monsters/random encounter charts for the Feywild. Or just decide its time for a fight and pick an appropriate challenge! Jump them while theyre traveling/resting for max effect. Give them their combat. Also, make use of the Jabberwocky in the final chapter; use it throughout the campaign! It can fly past shrieking from time to time, and theyll KNOW they cant beat that thingmake them fear it.