With 5k STEEM I'd re-launch my work on Steemmonsters/Splinterlands to disrupt the obvious monopolies that have formed. I'd use most of this as capital to fund an automated card buying bot, but I've also been working on rentals, bids, the general market I had before, and I'm interested building some of those 'delegation teams' that have formed to play hodl'ers cards.
I'd also like to see what everyone thinks is underdeveloped and in need of attention in this world. Been dealing with 'real life' and disconnected, but recently powered up 2,800+ SP and trying to get re-engaged here again.