The rewards for a post are 50 per cent author reward and 50 per cent curation. You have earned around 1.6 million in author so far.50 per cent of that is 800k . I do not know what you have made from curation. I presume from your post that you are supporting the thriving minnows with your own stake right , which in turn will give you some of that 50% curation for their posts. That would add to your returns also. Now that is only if you have been upvoting other peoples content. And that is how you could have well over 1.5mil by now.