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Drawings will help tremendously. Extract the big masses, their respective interfaces to each others and the means through which they communicate. This will help build a mental map of the code and reduce the cognitive load needed to understand each separate part.

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If the project does not have circular dependency, it can be automatically drawn from the code like this:

http://lonnie.io/gostd/dagvis/

or this:

http://8k.lonnie.io/

What did you use to generate the grahps?

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