You need to use a larger image, and then it will be reduced to a small size.
As you already know, you retained the recommended aspect, and you also used the following properties:
The og: image property has some optional structured properties:
og:image:url - Identical to og:image. og:image:secure_url - An alternate url to use if the webpage requires HTTPS. og:image:type - A MIME type for this image. og:image:width - The number of pixels wide. og:image:height - The number of pixels high.
You used a smaller image that FB recommends in the documentation. Switch to a new size and it will fix your problems (twice as much as the image used)
I used a png image in og: an image of size 600x315
Image Sizes
Use images with a resolution of at least 1200 x 630 for better display on high-resolution devices. At a minimum, you should use images with a size of 600 x 315 pixels to display links to link pages with large images. Images can be up to 8 MB in size.

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