There is a video by Scott Manley, which specifically addresses your question:

Could An Astronaut Throw Something From Orbit To Earth?

The short answer is no, humans can not provide enough delta-v by muscle power to deorbit an object by throwing it from ISS.

There is a great video by Scott Manley, which specifically addresses your question:

Could An Astronaut Throw Something From Orbit To Earth?

The short answer is no, humans can not provide enough delta-v by muscle power to deorbit an object by throwing it from ISS.