Resizing brush strokes

Hi, I am working in cleanup for animation, the thing is, I made several drawings with the brush tool, but I made them in the wrong brush size. I know you can make the stokes thin and thicker if it is a pencil stroke, but this is brush stoke. I can’t turn it to pencil because it deforms. Please, tell me there is some way to fix the line width that doesn’t imply drawing everything over.

I thought of scaling it down to the right size, but then is there a way to repaste it bigger with the same line width? Is there any other way?

Please don’t leave me to die, thanks in advance!