The spiritual dimension is infinite but he can't underestimate the great mother by ruling out that she can't find him. It will be false confidence if he thinks he knows all she is capable of from the little knowledge he gained from a soul fragment. Even if she can't find him, the chances of him running into a feeding ground are the same as running into her. If he is unlucky then she might appear before he encounters a feeding ground.
But he can't just sit still and do nothing. That will not improve his chances either. The only thing he can rely on is his strength so he must seek strength no matter where it leads him.
He continued searching even after 7 years. None of the clones were born during that period of time. His situation is bad but he is not envious of Aeternus who is being ravaged by Chaos energy.
He thought to himself, "Maybe my situation is not so bad. And we can rule out the possibility of Nether waters being Chaos energy."
