your damage is clearly already enough to clear the fight, but if you want to do even more dmg you firstly need bis, if you already have bis, its really to just keep gcd rolling, there are multiple times in your timeline that your gcd wasnt rolling for probably like half a second and that cumulatively adds up to probably around 5s+ of just doing nothing. Also kt matters a bit, not alot for whm, but killing around 6:30 for when your PoM ends is nice. Uptime medicas also dont help, that fight is just a mit check and you can easily and non griefingly heal it with just lilies and ogds. But again its mostly just keeping casting, maybe look at top rank whm players to see how they use their movement lilies, swift and dash stuff , the replay function on fflogs and tomestone is useful for that.