It often helps to separate between intrinsic motivation (creating for the sake of creating) and extrinsic motivation (creating to obtain a new or separate goal). Here's a non-exhaustive list of motivating factors propelling the drive to create. It is important to note that some factors can be both intrinsic and extrinsic and that a person can derive both types from the same activity. Please feel free to add more in the comment section below:
INTRINSIC
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