How can I make my audience engage more and gain trust towards my products and services?

Hi, I just started Digital Marketing 2 weeks ago, and i just wanna know how I can attract my audience to purchase my product. Because until now, I still don't have my first sale. I have been consistent, have my own brand kit, know my audiences and how my product can help them, and a proper content strategy. I also share my post to Facebook groups to find my audience, but still no one finds me. I am here to seek some advice, how can I sell my products properly? Is their something I should do? Please help me.