Hello and welcome,
It would help to know what kind of subjects you like to take pictures of, this will have an impact on what your sensible choices are. I'd be surprised if a prosumer camera will produce good enough quality output to be saleable to stock libraries but I suppose it depends on the subject matter.
I'd agree with Stephen's suggestion of alternative lenses as a first step, but again it depends what you're taking pictures of.
Regards,
Duncan
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