Welcome, @katy! 
Silverbear shared some fantastic advice, adding to that Iām happy to recommend my go-to creativity booster: the crystal Carnelian 
Carnelian- a red/orange stone of the flesh, it is commonly used to boost both creativity and motivation.
It takes a central role in this Motivation and Creativity Spell. You may also find inspiration in some of the Art Witch threads throughout the forum 
Good luck and happy creating, Katy! 