Sonia, I am sure you know, that digital marketing is the key. However, marketplaces, WhatsApp, Instagram and YouTube videos etc, will increase customers for you.
Report Zain's answer
That depends on what you are selling. You need to decide who your customer is and start searching online for websites, blog sites, etc. that your sales prospects visit then advertise on those websites. After you have accomplished that, you will then begin to scale up your advertising and promotion efforts based on what you learned from finding those first few customers.
Also, you need to tell everyone you can about your company. There are websites that accept blog posts about new companies. There are companies that do press releases - those are stories about new companies. You should be doing everything you can to promote your business.
Peter Drucker said "Hit them where they ain't." That means be innovative and creative with your advertising and promotion. Come up with ways to promote your business that others have not thought of.