Humans crave certainty, take advantage of this.
I’m not suggesting you be dishonest. Far from it. Instead, create for and relate to your audience so that they are certain you are a trusted adviser for them.
In order to be truly certain that you have the best solutions for your clients, you will need to do some work to determine who you’re selling to.
If you are a coach, consultant or small business owner, use the same approach when marketing your services. Find a way to promote yourself that offers certainty.