Heh, having a marketing/SEO team (or any kind of team really), or hiring even a single person is probably going to be out of the picture for years to come, at best. We try to present ourselves professionally, but we are, at the end of the day, just a bunch of volunteers.
Tapping the community for some kind of organized effort might be a good idea though. We'd have to understand a little better what kind of needs visually impaired people have, and how to best aid them with alt text (because I wouldn't even know where to start - though that Hubspot page does look like a good resource). So we'll keep this in mind