Which rag raid are you using that against? And which part of the rag are you struggling with? Also, do you generally join raids where you need to carry (might be hard at 55k power and with little ascension)?
I haven't touched my water team in a while, but if I had to guess, you need more exceed in your grid if you can get it.
Also, if you feel like you can't dish out much dmg, there's no shame in using Andro or Joan for raids. There is absolutely no difference in drops between being 3rd place and dead last, so if you aren't going to (V)MVP anyway, focus on keeping the top players alive rather than optimizing your own dmg output. It's a thankless job, but until you can carry a raid, there aren't many good options. The only exception is maybe light rag - Andro isn't that useful there unless the caster lives for a long time (but if that's the case, the raid is almost guaranteed to fail, so...) Joan can be useful with some coordination, but most ppl can't survive the deathbeams without getting dmg cut up to near 100%, so still largely useless.