Green fluffy mini backpack NEW condition

So here’s the story. I desperately wanted this for my birthday so a friend got it for me and I was stoked until I wore it to show it off just walking back and forth in my living room and one of the straps completely detached?? Zero damage to the stitching, it’s perfect and clean and literally new and I don’t want to let go of it but I can’t sew to save my life and without the other strap attached I have no use for the bag. If you know how to fix this bag, congrats you just got this bag at a huge bargain simply for having that kinda skill - go you! Let me know if you have any questions :)