Q.Zoysia grass dying everywhere I weedeat
Everywhere I weedeat my zoysia grass is dying

Are you using a mechanical weed mechanism?
You may be trimming down too severely and damaging the turf roots.
Hand pulling the weeds or even using manual weed trimming tools may be best.
These links have more information on Zoysia lawn care.
https://www.gardeningknowhow.com/lawn-care/specific/zoysia/facts-about-zoysia-grass-zoysia-grass-problems.htm
http://www.clemson.edu/extension/hgic/pests/weeds/hgic2310.html