What do scientists do to receive suggestions and criticism of their research from other scientists

Publish papers.

Explanation:

When scientists want to receive suggestions and criticism of their research from other scientists, they can publish their work. The publication of a scientific work is the result of scientific research and happens when scientists make the results of their research in the most diverse areas of knowledge accessible, making their research public for the entire scientific community. The publication of a scientific or technical work is a way of transmitting to the technical-scientific community the knowledge of new discoveries, the development of new materials, techniques and methods of analysis in the various areas of science, as well as allowing research to receive criticism and suggestions.

conduct peer reviews, Publish papers