This interesting resource is actually not specific to Overwatch. RocketJumpNinja is a very experienced Quake player. This resource is still extremely useful for Overwatch players, however -- it covers a number of psychological aspects to competitive gameplay. "How to Get Good" may be able to help you set your mind right and improve your gameplay!
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Want to hear about new resources? Suggest changes or updates? Berate me for writing or adding garbage? Come hang out in my Discord. It consists of a channel where I only post updates for this resource thing. It may eventually contain further channels. I don't really know how to work this thing oh god help I need an adult. "This thing" being social interaction, not Discord.