If I have 1 million SP i'll be able to curate about $500 upvote on a post which is massive. First I'll have to draw out plans and I'll from time to time organize different challenges with rewards to boost the community and invest on bots that will assist me in doing that. From time to time I'll have to be checking for good quality posts that benefits the steemit community and give them upvotes.
Having such high steem power will mean I have been able to make lots of money and this will enable me set up a place for homeless people and the less priviledged to help them acquire skills, teach them about steemit and also shelter them if possible but I know the trainings will put them in a better position to face the challenges of the society.
Basically all works would be on improving the steemit community and if I have such steem power let's say at the moment the first step will be to improve and trend sports on steemit which is an area that I have observed this community to be lacking in at the moment . Definitely other projects to reward hardwork and talents will come up such as music contests. For instance organizing a steemit Idol competition with Judges and tutors available to groom the talents and giving SBDs or steem as prices will go a long way in improving the steemit community.