TPO Ponding Options

I have a fairly good condition TPO roof with a good slope. The problem is the corners where the drains are, the water has to flood into the drains. Whatever does not flood into the drains just ponds of my roof till it exaporates or rains again.

What are some options I can do on my own to level the corners, what products are available that will adhere to the TPO membrane? Thank you all for your responses and experience.