What is the necessary action required in the subsequent year to prevent significant waste of time invested in a skill learned the previous year?

Answer

Consciously scheduling low-intensity maintenance time for the prior skill

To combat skill decay, retention must be built into the following year's plan; this includes scheduling dedicated, low-intensity maintenance time to retain proficiency from the initial investment.

What is the necessary action required in the subsequent year to prevent significant waste of time invested in a skill learned the previous year?
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