Just keep swimming

We've been Learning to add detail to speeches here is my example of one.

Settled on a mossy rock Marlin sat, Grumpy at his friend Dory because she lost his only ticket to finding his son Nemo. Dory Approached Marlin and called obnoxiously. “Hey Mr grumpy gills, When life gets you down you know what you gotta do?”  “I don’t know what I gotta do.” mumbled Marlin. “Just keep swimming, just keep swimming, just keep swimming swimming swimming.” “No Singing Dory.” Yelled marlin! But Dory carried on. “DORY STOP IT’S GONNA GET STUCK NOW IT’S IN MY HEAD !” Screamed Marlin. “Sorry...”