How Do I Save This Shirt
It's unlikely that you'll be able to disguise the holes in any way that's not noticeable; instead, I would recommend looking into the Japanese process "sashiko," a mending process made deliberately visible. Based on your other questions, you are quite new to sewing and embroidery, so you may wish to start with a more simple pattern like the one shown on the bottom; with practice, a wide range of more complex patterns exist that you can use in the future.



A wide range of online tutorials exist to get you started, frequently focusing on a diamond or square pattern similar to the bottom example; the repair will be solid and should help prevent further damage to the area, and will make your shirt uniquely your own.