Does the Bard Need Help at Later Levels? Let's Fix Courageous Anthem

The bard. The BEST support class in Pathfinder 2nd Edition. They inspire courage... erm, I mean they sing courageous anthem. They buff their allies with their signature composition cantrip, improving attack accuracy and damage output, and even bolstering the team against fear effects. But... but... but... do they need help at later levels? Courageous Anthem is fantastic, at least initially, but it is one of the few spells in the game that does not scale. At. All. Not at all! No changes from levels one to twenty. So how can that be? How can it be balanced from levels one all the way to the end? Or does it actually need some fixing? Check out https://critbuilder2e.com/