Bummer!
To mend knitwear I just use a basic darning method. I join the wrong side edges together in a line then sew very small stitches in a matching yarn. It always shows a bit. For your knit, I would run the line in the same direction as the rib (shoulder to cuff) rather than across ways to disguise it some more.
You could consider decorative patches or ribbons as a way of disguising your mending.
On the cuffs, you could put velvet ribbon around each cuff to disguise the mend. For example, a graduated look of 3 velvet ribbons of the same colour and different widths could look nice. (Obviously you do both cuffs so it looks intentional.)
On the body, to disguise your mending you could use decorative iron on patches. There are lots of designs available on Etsy or at craft stores. You don’t have to use just one patch on each hole. It might actually look better to create a design from several patches so it looks intentional. I did this once to jeans using butterflies and flowers but there are lots of other possibilities: birds, letters, flags, skulls, logos.
This jacket for instance has a similar texture to your knit and looks pretty cool.
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