If you have less time, you can consider skipping Khyber Himalayan Resort and Spa that takes up most of the time and budget on the itinerary. In that case, you can extend your visit to Solang Valley to enjoy more activities, or consider a relaxing trip to Vashisht village known for its temples and natural hot-springs.
On the other hand, if you have more time, you may want to consider visiting other attractions such as Manu Temple, Beas River, or Rohtang Pass.