How to determine your own weaknesses as a player?

First of all - I am sorry If I am posting in the wrong section but I am not sure where to post the question. No to the main topic. I support main and I am trying to improve myself as a play. That to be said - if you want to improve you first need to know your own weaknesses. So my question here is - how can you do that... Any ideas? Thank you and hope to get some good advice :).
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