You can actually maximise your curation rewards by voting on others, not just yourself although since you've invested a LOT you are free to do whatever you want with it. Curating other's post will help distribute Steem better, in turn improving the platform for us all.

But more importantly, with your SP level you could easily make 300-500 SP/week with some excellent curation around Steemit. When i was curating actively before my accident, I was managing 130-140 SP/weekly from curation with about 11K-12K Steem Power. :) So there's a lot of upside to curating excellent content and new authors on Steemit.