The way you do this is one, make sure your site is HTTPS because most of the sites that are at the top are HTTPS these days. And two, your site needs to load fast. If it doesn’t load fast you’re not going to do as well with voice search. Three, when people are typing in questions, they’re typically typing in longer-term phrases. So your questions, and especially your answers need to be short and to the point. If your answers are a paragraph long you’re not going to do as well compared to if your answer was one sentence long.
The trick? Find the right influencer in your niche so that you're targeting the right audience. It's not just about spreading your message. It's about spreading your message to the right consumer base. If you can do that properly, then you can likely reach a sizable audience for not much money invested when you think about the potential profit it can return.