@Lee277 I think you don't understand the plus program. It is NOT Super Host Plus, it is AirBNB Plus. Superhost is all about the host, the person who runs the listing, while the PLUS program is all about the space.
Any listing may apply to be in the PLUS program. If this is what you want, and be careful what you wish for, then apply. But before you do, realize that you will no longer have a listing description; AirBNB can and will prescribe what new furniture and decor you must purchase; you will have no control over the photos; you may not list the space on any other booking platform. I would also recommend that you read other PLUS host comments. For some hosts, it has been a very good thing for their business; but for others it has not.