Well, I do have an idea that would help Sym, Sombra, Ball be useful without people demanding they switch.
✅ Modified 1-3-2 that can be 1-1-2-2
As for Zen, he probably just needs a buff or whatever the dominant meta is to move more towards Dive. For instance, allowing discord to ignore barriers.
That said, Contenders meta is moving towards Zen/Brig