How powerful was a Type 4: Tier 5 existence?
For starters, the Outer God in Terra was only at the peak of Type 5: Tier 1.
Currently, Linsley was at the initial stage of Type 5: Tier 1. With his current power, defeating the Outer God was almost impossible.
Linsley's Invisible Providence Ascendence could only affect an entire solar system, and that was due to his power as an Upper True God at the initial stage. In contrast, the Outer God could influence multiple solar systems due to being at the peak of Type 5: Tier 1.
But if he became a Great God (Type 4: Tier 5), he'd be able to affect an entire galaxy with his Invisible Providence Ascendence avatar.
As long as he reached Type 4: Tier 5, he could defeat the Outer God and free Terra from its enslavement. The Avatar Syndicate would finally rule over Terra, uniting those in the resistance.