I have some other websites as well for which I pay around 1000 USD per year like www.diaphragm-manufacturers.com and www.rubberseal.in. Whenever I am paying for these sites they start generating more traffic than the existing site within a week. The content of the original site is much better still it does not rank higher, so I understand that link building is the most important thing here.
So what is the best way of doing that?