Preventing Hoax Belief

Looking back with 20/20 hindsight, what should NASA have done to
proactively prevent the moon landing hoax believers?

We brought back a staggering number of photos, good videos (of later
flights), almost a half a ton of rocks and twelve walking and talking
eye witnesses. They left laser reflectors. They filmed dust falling
in vacuum. They filmed a feather and hammer falling in vacuum. They
launched in public, and were monitored throughout all phases of the
mission by everyone with a radio telescope (including the USSR).

I'll grant that the hard-core conspiracy theorists are a lost cause
(e.g. flat earth believers). But what could they have done to remove
the fashionable doubts which much of the population now has? What
convincing piece of evidence (that wouldn't consume appreciable mass
or time) could they have devised?

More troubling, with the recent advances in computer graphics, what
can NASA do in 2020 to prove that Apollo 2.0 is not a hoax?