How to create a good quality custom decal

I have tried to create a decal 19mm wide x 400mm long for an electronic board, I exported this file to bmp, tif, jpg, png when exported the picture looks blurry and the letter are distorted, is there a way to create a good quality custom decal that allow me to read the letters. I notice if I divided the drawing in 3 parts and import each decal I can get a better image but still the quality no good.

Last picture is the decal in solid works numbers and letters are not clear

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