Hello Jackb!
I suggest you stick to what you are doing. Your website's blog page will drive more traffic but only if you keep sharing the blogs on different Social media platforms like Facebook, Twitter, Pinterest and other and on SEO platforms like Guest posts, Link building, Forums, images, and others. As far as the external WordPress blog in concerned, You can set it up but don't close the website's blog page. External WordPress blog will help you to link back to your website's blog page and it will drive more traffic because it is the part of [link removed by moderator. Please check the FAQs for new members and commercial links]
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