You not having heard of 8kun really hasn't done a damn thing to slow down QAnon, actually. You're not in their target audience and they don't need you on board to achieve their purposes.
The best way to combat conspiracy theories like QAnon would be for our elites and institutions to stop constantly preying upon the people and lying to them about it via a neutered press, and actually hold some members of their own class accountable for once. The massively corrupt corporate giveaway that was the Covid stimulus is a great recent example. The Epstein case being slow walked by the FBI for 25 years and then trying to sweep it all under the rug with "oops he killed himself while the guards were asleep and the cameras malfunctioned!" is another. As long as this kind of stuff continues, people will attempt (often haphazardly and incorrectly) to understand how and why it isn't being stopped, and who's in charge of it. They will be easy targets for grifters and bunkum artists who rush in to fill the gaps left by complete radio silence on the part of mainstream media sources.
You know, I don't agree with QAnon and think it has many properties of a dangerous cult, but they do at least have one advantage over run-of-the-mill liberals in correctly identifying the ruling elite as the chief cause of the world's problems, instead of constantly focusing blame on "deplorable" Trump supporters with zero actual power or influence.