Minimize HTTP Requests Look to combine all scripts into a single script, and similarly combining all CSS into a single stylesheet.
make a correct H1 and H2 header
connected with social media using the API's
Fix URL Canonicalization
Fix DNS server is not using an SPF
Fix 30 url errors on webmaster tools.
Create backlinks white hats
Make site set friendly.
Make sure that there is no error in template front end and back end.
Speedup the site last then 4 seconds.
Check seo keywords on the homepage and looking if they rank good.