If you take care of the customer, the business will take care of itself. I have operated as a sole trader for a while and never had to advertise beyond my existing clients - the work comes in.
Thank you for the advice. I always go above and beyond while doing my job.

Make business cards and flyers and pass them out.
Is there a website you guys use or recommend to make business cards and flyers with? And what software should I use to make the flyers? I greatly appreciate all the help from everyone.