Open Access publications have higher citation and download rates - see SPARC website.
You can publish and share much more than just publications - research data and software are also important!
Promote and share your publications on social media sites. Twitter is an especially good tool for this as all public tweets can be searched. See the following article for more information:
Track your research impact using Altmetrics. This website measures the attention a publication has gathered based on online activities in social media, mainstream media, online reference management tools, policy documents and patents.
Make sure that whenever you mention your research online, that you use or link to a page that includes your work’s unique identifier, this can be a DOI, arXiv ID or PubMed ID. This assists Altmetrics to track your work.
For more information about Altmetrics and looking at alternative measures of impact view the Alternative metrics guide.