The best way to get the first clients of your consulting business is through the networking. People close to you or that you meet at professional events, with whom you can speak face to face to define objectives and priorities, will allow you to get to know your client in depth and offer a high-quality service.
With the experience of developing several projects through close contacts, and having managed to offer a quality service, word of mouth and recommendations will easily provide you with New customers.
In the future, what you will need is a system to scale your business, and that is where it will come into play and become especially important. Internet, sales funnels and marketing automation.