There's a lot more to a trip than visuals IMO, but if you are truly only after the visuals than I would suggest not taking any of your meds for at least 6 hours before your trip, do not eat for 4-5 hours before your trip, and use a strong variety of cubensis mushrooms. IME visuals are jsut that, they are slight changes in visual perception, you might have them and not even notice or recognize them if you are waiting for a pink elephant to appear in front of you lol. Also anxiety and build up from your expectations and previous disappointments could be preventing you from letting go and just going with the trip.
Like someone else posted previously, you have a better chance of finding what you are looking for when you stop looking for it. Let the visuals find you, not the other way around. Also try tripping in the dark/nighttime or bright/daytime....for me visuals are more intense at night, but some people are dfferent. just try different things out, and have fun