Because the Crouching Tiger Mountain Range is an uncharted region, the maps here are not complete and some parts don't even match.
Chen Guan didn't encounter many Secret Spirits on his way, because humans might even outnumber them. In areas that have already been explored, it's really hard to find a Secret Spirit to kill.
This made Chen Guan very grateful for being able to join the Celestial Court Army, otherwise, he would have had to fight for Secret Spirits like the regular Cultivators in the public Secret Realms.
Leveling up would take who knows how many years, it's just too difficult.
When he got near the Crouching Tiger Mountain Range, there were noticeably fewer people. Once in the mountain range, practically no other Cultivators were in sight.
Chen Guan stealthily snuck into the Crouching Tiger Mountain Range, but the map was useless as many places were incorrect.
As Chen Guan explored a large mountain, he surprisingly stumbled upon an old ginseng.
