Its amazing if you would have asked this a few months ago my answer would be really different.
If I bought 1 million steem i would have probably delegated most to bots for passive earnings and projects that provided passive rewards.
Now im not sure what I would do as my answer would probably be keep it and currate, but with that much Steem Power I dont think Id be very efficient curration with that much Steem Power.
Another thought would he to break up some of that Steem and buy some tribe tokens so I could be a whale on Steemit and other tribes like leo, neox, and pal.