Hi @hannah-f, if you have a macro lens already, you certainly will get better results by not reversing it. 🙂 The usual reason for reversing a lens is if it can’t focus close enough to the subject to obtain a nice close-up photo. Since a dedicated macro lens is optimized for focusing up close, there is no reason to reverse it.
(Another reason for reversing a lens is that a wider angle lens will give you more magnification when it’s reversed. Conversely, the longer the lens, the less magnification you’ll get from reversing it.) If someone wants a cheap “macro” lens with LOTS of magnification, they can get an old 28mm prime lens and reverse it!