Q.Compost
What can I add to Grass clippings only compost that is already composted to make it appropriate,to use Thank you

Certified GKH Gardening Expert
Actually grass clippings can be used right away without composting. But adding some brown material such as dry leaves will balance it out. If the clippings are composted just add some commercial compost to balance it out.
These articles should help:
https://www.gardeningknowhow.com/composting/ingredients/grass-clipping-composting.htm
https://www.gardeningknowhow.com/garden-how-to/mulch/mulching-with-grass-clippings.htm