One way to help boost SEO/SEM would be a Reddit campaign to create linkbacks from comments in niche subreddits to specific posts on Steemit. Google may have made tons of changes to their algos, but nothing beats good ol fashioned quality linkback growth from high ranking sites.
Re: reviews, we could try to organically get the ball rolling with an agreed upon tag. #steemprojects seems like the most obvious one to stick to, but what it really needs is a plan of attack for filling it with reviews of each project. The backlog of reviews to write would be no small task, but once its caught up it should be maintainable as an established community norm for steem projects.
Great suggestion for sure! Its overwhelming keeping up with all the projects aiming to build onto Steemit's foundation.