Is there any way to reach out costmomes that buy my pack

I was wondering if there is any way of contacting people that have my pack, I would mind getting feedback and I am looking at changing the pack, e.g. changing the UVs on most models and compressing certain models onto one textures and adding more content, I mean I think I can reduce the size of the Pack(in terms of "bytes) by maybe half, I would like to know if it would worry any one. or just a “heads up” / notification in the library to tell people what I plan to do to let them know, it only a $9 pack it not huge but still

I understand about the privacy thing, it most likely a indirect contact through Epic launcher