I think Belos' death would feel, y'know, a bit more impactful if he died right then and there when Luz ripped him off of the heart of the Titan instead of him just getting stomped to death
King should've discovered more of his Titan powers
And finally I would let Belos possess a random little creature to show that he's still alive (because come on, Enzo Gabriel smashed him against a wall, how should a little bit of rain and a few stomps kill ths literal demon)