Hey! It can really depend on the model you're using, which are you using and have you tried a few? And have you tried modifying the temperature (try increasing it)? That may help make it more creative feeling:
If those don't help it may be the character. If the character prompt length (i.e. personality + scenario + example dialogs + first message) is too long there may not be enough context length left. So trying on some different characters may help things.
PS. If you want to join the Discord we can chat back and forth more easily, would love to help you get this working better.