Google updated their algorithm very frequently but one factor considers always top priority for their ranking criteria and that is backlink support of website. Backlink is the number of links to your site from other sites (other site point out your website link). The site which has more quality backlink support will have a more chance to get higher Google rank. Other major search engines also have their own algorithm and they also consider the backlink support as a critical factor of the ranking process.

Niche directories are focused directories that have specific categories for niche topic only. Submitting the site to those directories will give you relevant backlinks and that have a more value for ranking purpose. And niche directories can also send you better targets traffic too.

Deep linking is to accept your website’s inner pages rather than home page only. Aside from niche directory and general directories, there are deeplink directories that accept deeplink submissions. It would be beneficial to spend some time to finding as many deeplink directories as possible and submitting your inner pages to those directories.