⚠️ Warning before I draw more about this, if y'all feel uncomfortable I won't post them on this platform:
This is a cannibalism AU. After nearly dying and Silco took her to Singed, Jinx was injected with a massive amount of Shimmer and put through severe drug-induced trauma...
If you actually believe changing who Katara ended up with would somehow fix her writing, then your issue isn’t actually with her character.
Your issue is that your ship wasn’t canon.