Here are a few suggestions:

1. Use Search Engine Optimization (SEO) to improve the visibility of your research: https://explore.researchgate.net/display/support/How+to+use+SEO+to+improve+the+visibility+of+your+research

2. Create Research Spotlights: https://help.researchgate.net/hc/en-us/articles/14293040489745-Research-Spotlights

See also these related discussions:

https://www.researchgate.net/post/How_do_you_increase_the_visibility_of_published_article/1

https://www.researchgate.net/post/How_can_I_make_a_previously_published_article_book_or_book_chapter_more_visible_and_accessible2/1

https://www.researchgate.net/post/How_to_increase_the_visibility_of_our_research_articles/1