Here's a bad marketing tip.
I just received an email from a company that I think is great; I've done a lot of business with them.
They sent a short note (captured as a picture) to me via email. It said Happy New Year and included their logo. It was nicely done, short and to the point.
However, there was no phone number to call or website listed. I couldn't even click on the picture to visit their website. Now I know their website address, but that would have required a little too much work on my part, so I chose not to visit.
What are the chances that nice email could have wound up in the hands of a prospective customer? I'd say pretty close to 100%. You won't increase your profits if you don't make it easy.