This may likely be the dumbest idea but here goes:
Allow more users to join steemit.com. Forget bidbots, spam, content, or even the technology of steem for a second. The fact here is that no many people have accounts on steemit so they can not fully utilitize the crypto steem or sbd.
The more demand the higher the prices. For the argument with more spam and scams I say it is par for the course. There will always be people out to take advantage of others and the more demand a coin is the more likely it will happen. However if a coin will survive for the future indefinitely there must be also people who will defend and protect. A yin and yang where evil will exist but good will come in to curtail the bad.
Lets face it, facebook, twitter, snapchat, wechat, and so on are platforms that are very successful because there are a ton of subscribers. The age of social media is only as rich as how many subscribers they have.
The more users means more content, The more content the more likely there will be more good content for the steem blockchain. The more the steem blockchain holds that has value the greater the value everything related to steemit will be. Including Steem and SBD.