When you post something to your Facebook page, something that has a link, make sure the link is in the second or third line of your post content.
If you do this, the link will show up without someone having to “expand” the post for “more.”
I also recommend that you put the link at the bottom of your post, along with your phone number.
The first image here shows what most people initially see in their feed. Note the option “See More” to see the entire post.
If this link was NOT in the second or third line the reader wouldn’t see it at all if they did not click on “See More.”
By putting a link in your second line, someone who sees the post will always see and be able to easily click on your link, even without using the “See More” option.