When you don't make your websites to be mobile friendly, you are definitely cutting off over 50% of your traffic because most people now prefer to use their smartphone to access most sites.* Forgetting that faster is better. The first thing we'd like to touch on his site speed...
*Trying to rank for the wrong keywords.
*failing to invite people to visit your site.
*Neglacting to write awesome content.
*No call to action for your visitors..
*In short...
*No thinking ahead :The future is mobile....