Most of that is patch disease. Too much water and thick thatch. The thatch/water also attracts bugs and they will eat your grassroots putting holes in your lawn. Mowing low dethatches and encourages rhizome growth instead of stolon growth.
Empire Zoysia:
Mow to 1.5" every three weeks. Bag or side discharge. Take a leaf blower to any clumps.
Water 60 minutes (Hunter rotator heads) each zone every 4 days.
That is all. It will probably take an entire growing season to look nice.
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