promote your link ONCE on social media sites twitter, FB, Pinterest etc. Read and share and comment on the work of others and they will likely reciprocate. Ensure your hubs are keyword researched and that you make good use of subtitles, plenty of capsules etc. Look for reputable websites or blogs and ask the owner if they will link to your hub. Make sure all of your content is grammatically correct, flows nicely and offers good information. Google penalizes sites that have poor content.