what type of professional to hire to help with site traffic

I am hoping this was the correct forum to post this. I did my best to figure it out! I am feeling like I need to hire someone to work on getting more traffic to my site and have no clue where to start. I don't just want to shell out more money to Google for more adds. I would like someone who would work on getting better organic and shopping rankings/results. What type of professionals help with this? I need to be pointed in a direction. thanks! WordPress ...