Since the foundation of the Law has been established, simply comprehending it further won't lead to significant improvement. To upgrade, one must enhance their own Law to the required limits and then make a breakthrough.
Starting from tier seven, the gap between each level is vast, much greater than the gap between the previous three tiers.
Moreover, after reaching tier seven, the situation where every three levels had a bottleneck disappears. Now every single level has its own bottleneck, but it's no longer the kind that requires a large amount of Crystal Coins to break through.
To break through each new bottleneck now requires comprehension of one's own Law first, before reaching the next tier. Similarly, this applies to one's skills, where comprehending the respective Laws and integrating them into skills is necessary to achieve a breakthrough.