1. Update the pages on your website frequently. Stagnant sites are dropped by some search engines. You can even put a date counter on the page to show when it was last updated.

2. Offer additional value on your website. For affiliates and partners you can place links to their sites and products and ask them to do the same for you. You can also advertise their books or videos, if these products relate to your industry and are not in competition with your own product.
...