Typically, duplicates are determined by a combination of feedback from the question-asker and the community's agreement or disagreement (as expressed by people casting or declining to cast reopen votes). In this case, the community doesn't appear to agree that it's not a duplicate.
However, as the other question doesn't seem to solve your problem, it probably isn't a duplicate. So, I used my discretion and super-vote to reopen it to remove the duplicate link.
However again, the question is asking for a solution to a design goal that can be solved in hundreds — perhaps thousands — of different ways, none objectively better than the others. That alone makes it too broad because it makes the voting system non-functional. Additionally, those many solutions can only be expressed by entire complete game systems, making it too broad in another way.
This question simply isn't going to work effectively in our site's Q&A system. It would be quite at home on a discussion forum though — the question isn't bad, it's just that this site is the wrong tool for the job. See I've been told my question is better suited to a forum, but where should I go? for our curated list of RPG discussion sites if you decide to go that route.