The method I had in mind was soaking it and then using brown paper tape to tape it along each edge to a wooden board. It should then shrink slightly once it dries, which can remove the wrinkles.
And probably wreck all the drawing.
I've done that with cotton-based papers (before applying art) but never seen it done with trace. It sounds a bit dramatic to try.
@hoefla started
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The method I had in mind was soaking it and then using brown paper tape to tape it along each edge to a wooden board. It should then shrink slightly once it dries, which can remove the wrinkles.
And probably wreck all the drawing.