For some reason, join tours are not very popular in Mongolia. Even in Ulaanbaatar, which is the most accessible city, they are almost non-existent. Of course, if more people go on the same trip, the cost of the guide and transportation will be reduced.
If you want to join a group, you can. We will let you know if there are people who want to travel with you on the days of your trip. Then you can travel with those people. If someone does not join, it means that you and your traveling companion will travel alone. This will of course result in a higher fee. You should understand this.