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Without the original source file here (yourfile.psd) the only thing I can suggest is to duplicate the blue brush stroke layer.  Then apply a Hue/Saturation adjustment layer ABOVE the blue brush stroke layer.  In the Hue/Saturation layer dialog box, click on the COLORIZE radio button and use the slider to point to the purple range (it's on the far right).  Now, hold down the ALT key for Windows machine or OPT key if you use a MAC and move your mouse in between the adjustment layer and the blue brush stroke layer and click.  This clips the adjustment layer to the blue brush stroke layer.  Yeah this would be easier if we had the original source layer.  Now to tell you how you could repeat what you did in the first place is just not possible.  We don't know what you did to begin with.