New at assasin LOT OF questions

Im playing naginata assasin i barely come to destruction but at destruction im dying all the time.
i have all tier 6 items.
i have 3k health 15k defence.
Skills: all ways maxed. Perfect being qob shadow refugee laserblade maxed.

Should i do runewords on sacred items? Because i never found any sacred uniques. If i must do runewords whats your suggestions?

Switch to Flying Knife build at this stage as the Naginata becomes viable only at the late game again, after majority of Ubers are done and all

Just do as pa5call told you and you will be fine. Funny things I know this because I was at an similar level just recently.