Playground AI Upscaling sufficient enough?

Is Playground AI's 4x upscaling tool sufficient enough for print on demand poster quality in A 1-5 sizes? My current method for making posters to list on Etsy is as follows:

Create the image in Playground
Upscale in 4x using Playground's upscaling tool on the export page, it brings it from 1024 X 1536 to 4096 X 6144
Save to camera roll or files (PNG by default)
Edit in my Canva Pro A2 poster template and add my text on etc.
Download from Canva using PNG format, increasing the slider to the maximum of 3.125 or size 4961x 7016 pixels and using the "High" quality setting

Please let me know if I should do any further upscaling, and where in the process I should do it if needed. And is it better to export from Canva in PNG format or should I use the same settings but export with JPEG instead? Thanks.

Adam

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Playground AI Upscaling sufficient enough?