Is there a way to increase hallucinations on shrooms?

I've done shrooms about 5 times now, with highest dose being 4 grams as tea, other times were around 3 grams. I've never really had any noticable visuals though, the most I've experienced were mild distortions in people's faces, and a view of nature on TV looking a little trippy/surreal. Is there something I can do to make sure I get the visuals people talk about. Or should I just increase the dose?