Offer services and goods that people can purchase? There's a real need for a marketplace on Steemit. If you had a garage sale, you could sell stuff that you don't need that other people could use. If you gathered enough stuff, buyers would come. Most digital items are already in abundance for free, but if you want to keep everything purely digital, you could recruit some of the musical artists on here, and see if you could become their record label of sorts, and split profits with them, where you're doing the work of marketing and pricing and such, and they're doing the work of creating the music (which you would sell mp3s of for steem)

Also, something I just thought of that might have a few takers, offer to send postcards from different places in the world to people. Might have some people interested. Ask for a little more than postage and the postcard costs, and use the profits to buy more SBI ;) I actually really like this. I hope you don't mind, I'll also suggest it to another group.