Blurry print · Poster Print on Demand

Blurry print

Hi Everyone, Im a beginner so pls bear with me. I had a buyer complain that a print was blurry even though they said the colours were ok. My process is I generate the image in A2 size ( i found A3 fit best in my mockups) > Upscale it using "Upscayl" to use them in my mockups > once I sell the print > I resize it on canva to what the buyers wants > then download in JPG format highest quality as shown below. Am I doing something wrong pls? The image comes out at 300 dpi so not sure what was the issue.

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Blurry print