First, expand the chest outward, properly adjust the size and strength of the brush, and pull outward based on the center of the brush.

In order to make the chest look concentrated and full, you can turn down the brush, push the left chest to the right and the right chest to the left.

Then adjust the brush to be smaller and deal with other deformed places.

Finally, the two sides will be close to the middle, making the whole more full.