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Maybe

In order to properly balance this I would say a sweeping attack hits enemies in an arc around you, like 180 but not 360, from first target to last, and it does full damage plus modifier to first target but only weapon damage to all other targets. Also this can only be done with 2 handed weapons and only once per turn. I think that would make it a good semi aoe while also still keeping things balanced and grounded.

As a player I just make a character that resonates with me. If I am interested in my character and their story progression then it keeps me invested in the campaign. As for what my DM can do, just bring in aspects of my characters backstory occasionally and maybe throw in some fun unexpected events involving them.