I feel like there's two options for swain, because hes pretty damn weak (he's been out long enough)
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He can be made a bit more reliable (little faster E, maybe a slightly bigger E hitbox, little faster W)
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He can stay closer to a more juggernaut-oriented design and remain his clunky self, but his E needs to have 10-20% more AP ratio, and W should have 10-20% more AP ratio as well. Like most juggernauts, he'd be clunky, but if he does land his E it should hurt, if he does land his W, it should hurt, his R should also probably receive small damage increases, preferrably in scaling rather than base.
Maybe one thing that could happen regardless of which option is have the E expand in width by 25% on its return. But SOMETHING needs to be done for bird man, hes too clunky for how little damage he has.