What makes some superheroes more popular than others

Why is Ant-Man, despite being integral to the MCU, still considered a lesser-known superhero, with jokes being made about it as recently as Ant-Man and The Wasp: Quantumania? Why did Drax come out of Guardians of the Galaxy Vol. 2 the most popular Guardian, going up against the likable charm of Starlord and the reserved bad-boy archetype in Rocket Raccoon? Why is Iron Man, who was once considered a B-list superhero in Marvel comics, now the pillar for the MCU and Marvel heroes as a whole? Why are Batman and Spiderman *so* timeless, that they will likely continue to see adaptations long after we're gone?

There's an unmistakable draw to some superheroes. Captain America, a symbol of America in a time of strife, is now a symbol of the entire world. It's interesting to look back on superheroes, someone six years ago might not be able to tell you who "Doctor Strange" was, but is now a household name. Writing, staying power, casting, exposure, and adaptation all likely carry some weight in explaining why some superheroes refuse to die, while some fade into obscurity. With the unimaginable popularity of superheroes in modern culture, it should be analyzed just what, and how many factors make certain characters so integral to our culture.