It sounds like you have the monetization down pretty solid. The next step is getting the balance set up just right. If I'm reading your post correctly, it sounds like this game is going to have a very solid PvP element to it. If that is the case, you're going to want to make sure you have everything balanced super well.

Also, build for longevity. A steady stream of income is better than a quick burst and then the game is dead. You'd think this goes without saying, but you'd be amazed how many F2P mobile developers can't grasp this concept.

Will users be able to earn Steem through playing the game, or will you use a different SMT instead? How will combat play out? Is it hands on for people who want to be hands on? Can it be set to do things while you're away?

Probably the most important of the questions I'm asking: what is your minimum viable product (MVP)? How much of it is done? How long will it take to reach that point?