If want to remove the link from your posts and only show the preview card, simply put the link at the end of the text in the post. This only works if there is one link at the end of the text in the post. Lately will strip the link from the content and just include the preview card, but if there are two links in the content, or the link is anywhere except the very end, the link will remain in the post.
Without the link at the end:
With the link at the end: