Length increasing procedures require major surgery and implants such as Penuma and Alloderm grafts or suspensory ligament cutting.  All of these surgeries have a very high rate of dissatisfaction and are expensive.  Despite this, the maximum length you can gain from any of them is about 1.5 inches.  Therefore there are no available options to gain more than 1.5 inches in length.  Upsize however has a very high satisfaction rate, can get you almost unlimited girth and even 0.5-0.75 inches of flaccid length for a fraction of the cost and much more safely.  Furthermore, most partners overwhelmingly prefer girth to length therefore Upsize is the ideal way to please your partner.