Unify . . .
I folded my traced Celtic knot in half:
You can see the two halves are not exactly alike.
I drew over the lines with a black marker, shifting one path a bit, and compromising on the other places where the lines didn’t match. I drew over the lines on both sides of the folded tracing paper.
Then, I opened the paper, erased all the pencil lines, and folded the paper again:
This is gonna look MUCH better!! (Just wait until you see what I do with it!)