Although it's about collecting resources, at Du You's level, finding a suitable place to improve isn't so easy. Those tier-eight strong ones view worlds above tier-eight as extremely important.
Unless a special situation arises, they won't casually expose these worlds.
The higher the level, the greater the difficulty to continue improving, and collecting resources becomes more troublesome.
Du You can only gather intelligence while enhancing himself at home. And because Du You doesn't know when he might leave, others haven't gone out to improve themselves either.
Of course, Xi Qianxue and others have already reached tier-seven. With sufficient resources, there's no real issue not going out. The two continue to elevate their skill levels without advancing their own levels for now.
Day by day, Du You's resources are almost fully consumed.
