SMO and some off-page seo techniques such as blog commenting, social bookmarking, article submission and guest posting are the best techniques for promoting the website.

forum Posting, article submission, social bookmarking, blog submission are the best way to promote your website.

First Directory submission and Social bookmarking are the best and effective for promoting a new website.

I am sure that you will have lots of promotion tactics to share in here since you have been in the industry for a long period of time already.

Best technique to promote the website are
SMO
Forum posting with signature links
Posting classifieds sites