Q.Groundcover For Shade
Partial/full shade. Need perennial evergreen ground cover. Very poor thick clay soil. Large irregular shape area. Walk on occasionally. Want to use seed. Will add gypsum and amendments if needed.

Certified GKH Gardening Expert
Improving the clay soil for better drainage would be ideal. Here is how:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/how-to-improve-clay-soil.htm
Here are groundcovers for part sun to shade:
https://www.gardeningknowhow.com/ornamental/groundcover/gcgen/part-sun-and-shade-groundcover.htm
https://www.gardeningknowhow.com/special/shade/ground-covers-for-shade.htm
https://www.gardeningknowhow.com/ornamental/groundcover/gcgen/groundcover-for-foot-traffic.htm