I have never worked on boots and it is hard to tell without a picture, but if stitching is the only thing to repair, it is something you could nost likely learn to do yourself. All you need is 2 needles and a thread.
You don't even need to do it perfectly if the eastetic of the stitch is not paramount.
https://video.nostr.build/d210f70a82c77f60d948efc313f1b66d4e39090568dbfee638129b7a87a190c0.mp4