The opposite of poor in spirit is rich in spirit. Jesus’ announcement is not for those who are good at being spiritual. If you haven’t mastered being super spiritual, cheer up you are going to like Jesus' kingdom.
The non experts had never been invited in, until Jesus. Outside of Jesus the non experts are still not invited in. But, Jesus invites the ordinary folks into his kingdom. Pros and experts didn’t like Jesus. The non experts do.
Jesus isn’t telling you to be poor at being spiritual. He is not telling you do anything. He is just making an announcement about his kingdom. Jesus' way of doing things is for those who are not rich in spirit. And I accept that.