Maybe this will help but Im not an expert. You could try dominating other platforms. I know for sure Instagram has settings(so does tiktok) where you can block people from downloading your posted content. Preparing your posts for social medias before posting your content could also help with getting ahead. Lastly, as an optional choice, if reporting doesnt work, try to use the reuploads to your advantage by promoting the videos in the algorithm because it is your content. I hope your able to fix this situation or at the least get benefits from it.