I think everyone knows that changing the photo size leads to a lower quality. I also confronted this problem. Three months ago, I needed to upload a photo on a server, and for some reason, it just wasn't accepted. The photo size wasn't the right one, so I had to change the photo size. It is not a big deal, but changing the size means lower quality. Thankfully, I stumbled on this site https://imglarger.com/enhancer, and found out how to enhance or fix blurry images with no problems, or to improve the quality of my photos. If you want, you can also check the site I am talking about.