@Josue_Guerrero1, I infer from your use case that you’re mining your conclusions from disparate databases that come either from different generations of game design or from partnerships or acquisitions.
Perhaps your operation could benefit from an enterprise event bus model (vide Kafka, etc.) where there’s a constant flow of information rather than a “scoop and dump” approach?
Your workflow as currently implemented sounds challenging not only to MongoDB but also to a classic RDBMS. Perhaps you are cost-constrained and not inclined towards enterprise-class hardware such as IBM z architecture which runs both Db2 (a classic RDBMS) as well as MongoDB.