Should I go back to flagging everyone who comments on his posts? Or spam with more Kim Jong Un images? What do you suggest?
I'm going to suggest something crazy to you. What if you just give up?
What you're doing obviously isn't working. There is no incentive for him to stop. It's simple to just keep making posts and upvoting them without having to worry about what you or anyone else is saying about him. And as long as it continues to be profitable then why would he stop?
Because he cares about the platform? Nobody cares about the platform. They only want to protect their investment, however big or small it is. He's being very aggressive and using the means that he has to take as much as he can while there is still something to take.
What you're doing isn't working and is unlikely to ever work. Nobody cares enough.
Now, all that said, here is what I recommend. And I promise I'm not patronizing you or being snide. This is a 100% serious suggestion that you should open your mind to receive.
Why don't you help him?
Seriously. You can't stop him yourself. You can't get enough people to work together to stop what he's doing either, if that's even possible. Why not take advantage of your anonymity and throw your weight behind what he's doing?
Let's assume that 
You could even use upvote bots to promote those posts. Maybe do a little profit sharing. Turn it into an agency or something, maybe do a little marketing and PR for blockchain startups. What company wouldn't pay to get their article mentioned by either one of your accounts - let alone both?
I'm actually not joking at all. And the more I talk about it, the more I'm even getting tempted to do it myself.
RE: Message to @haejin and @ranchorelaxo + Flag Targets