In discourse Admin under /admin/site_settings/
there are various settings. I think title and the description fields are the easiest part.
Currently there are 344 pages indexed from this forum. See site:bnd.discourse.group - Google Search
I think other little SEO tweaks could be:
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adding more text to the welcome post Welcome to the Bnd Discourse
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add a link to the forum in the navbar of https://bndtools.org/
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Link from other websites e.g. a blogpost from your company. I can offer placing a link to our blog post.