my strongest tech with worldbuilding is to bind every cool aspect of a world to a character who does meaningful shit.
there's a cool metal? this soldier has armor made out of it
there's a sickass fighting style? this commander specifically uses it to fuck up their enemies who use the same style
there's a cool aspect to the magic? the only reason this gardener can harvest mandrakes is because of their silencing aura..
people care about people, first and foremost.