I don't think there are too many Corel Draw users left here. You might do better with the Corel Draw Facebook group https://www.facebook.com/coreldrawgraphicssuite
That said, looking at your image, I see lots of rough edges. I wonder if you would have better luck if you used Corel's drawing tools to recreate the image as simple shapes.
I did a trace in Vector Graphics, though Corel has a pretty good trace too, which might also be a way to go. The image in the PDF is vector and you can edit this if you want to simplify the design's outline.
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