I don't think this question can really be answered in a definitive way. Even if you could it would be very difficult to change your personality to fit into some idealistic mold. End the end you come off as disingenuous which is a trait many people don't like.
Aren't the SPs the most likeable? They seem to have that fun-loving personality that makes people want to be around them. They're accepting of others. Typically they know what's "cool" or "in style".
It's befuddling to me. I have 2 ISTPs in my family and people might think they're extraverts because they do get along with people so well, but they just have a knowledge of the unwritten social laws, and are easily liked by many people.