When creating a tassel drawcord, here are some important points to note:
Be sure your tassel pieces and drawcord grid size is set to 0.2 - 0.3.
Be sure the internal lines used for slits snap to the bottom edge of the pattern.
Create a tassel texture fabric for additional realism.
The video below shows you how to create a rounded drawcord with a tassel end. (Note: This video was recorded using version 2023.3.)