How to clear the thatch?

It can be seen from the description that you don't know how to weed, so I recommend three weeding methods.

The first method: manual weeding. The advantage of this method is that there is no pollution, and it will be very laborious to have more grass.

The second method: drug weeding. You can try herbicides to weed.

The third method: natural enemies weed. Patwood is sunny. You can plant bigger and taller plants to keep out the sun, which will make Patchwood wither over time.