'how to remove horizontal line with convert imagemagick

how to remove horizontal line and how to this text is more clearly?

i just try with this command but the image is still like this

convert img.png -colorspace Gray -gaussian-blur 9.0 -level 0,95%,0,1 -depth 1 -paint 0.01 img.png

So what is the magic parameter I have to use here?

my image



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