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IsaacNW82I would clamp/hammer it as flat as you can get it, then after if it is a minor amount sticking out still try to file that flat. If you can get everything flush or slightly lower than flush that's your best bet. IMO definitely start here.
I've heard of people getting replacement edge sections from tognar (https://www.tognar.com/replacement-ski-edge-section-12-inches/) but its a pretty involved process of cutting out space for the new edge, screwing it in, and covering it up which I haven't tried so can't say how it holds up over time.
One thing I've done out of desperation was to cut out all the messed up edge, file the ends of the edges to gently taper inwards (as to not catch on anything), and fill in the missing space with epoxy which I filed down flush-ish. This repair actually held up very well, and skis the same on snow and ice, but you can sometimes feel it on rails which kinda sucks