Let us look at this verse again but this time in its context:
"And I will gather the remnant of my flock out of all countries whither I have driven them, and will bring them again to their folds; and they shall be fruitful and increase. And I will set up shepherds over them which shall feed them: and they shall fear no more, nor be dismayed, neither shall they be lacking, saith the LORD. Behold, the days come, saith the LORD, that I will raise unto David a righteous Branch, and a King shall reign and prosper, and shall execute judgment and justice in the earth" (Jer.23:3-5).
By the context it is obvious that the action is in regard to things which will be happening on the earth. This is not saying that we are the "earth." By saying such outrageous things as that you are proving that you have little respect for the Scriptures.
Why are you so eager to put foreign meanings on practically all of the prophecies found in the OT? I think that you base most of your interpretations of the OT prophecies according to your preconceived ideas instead of what these prophecies actually say.
The prophecies concerning the Lord Jesus' birth and living on the earth and His sufferings were fulfilled in a literal manner. So why should anyone think that the other prophecies concerning Him will not also be fulfilled in the same literal manner?