I would suggest a new domain and make sure it's featured on your site already getting traffic. It seems like it might be of similar interest to the customers/visitors you already have, so the SEO (if all set up correctly) would likely increase on the new domain rather fast.
Redirects can be problematic for SEO building, but there are ways to do that as well. It kind of depends on the amount of work you want to put into it and your personal preference.
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