No Image Preview appearing While social Sharing

This is my Third Support ticket related to the same issue. The earlier tickets have not been replied yet.

See this issue has Disturbed me to the highest. I have been trying from 4 days on an issue and still unable to clear it. I cannot see preview images of my blogs while sharing on social platforms.
Check this link https://developers.facebook.com/tools/debug/?q=https%3A%2F%2Fwww.visitbest.in%2Fbest-mixer-grinders-under-1500%2F
The FB debugger shows no issue. Please tell me how to fix the issue.