Can I retrofit Hold-down stap ties?
Well your garage was designed using prescriptive code measures as I can see that that is a rather typical "portal framed garage wall panel". Normally those should not be less than about 24" wide or they do give the proper lateral resistance capacity. Most likely you would have to take this to an engineer that could spec the proper strong wall (Simpson or Hardy) to replace the portal framed garage wall panel.
I think Simpson has a steel strong wall at about 12" that would fill the bill. You may have to under-pin the footing though, with steel all-thread that would penetrate through the existing footing into the new under-pinned footing.
Either way it is a bit of work to accomplish.
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