Varying the composition of the ingredients

Question: Assume you have an invitro kit in mol bio lab and need to use it.It has all the ingredients to get yield of your product,which can be a protein or nucleotides. How will you ensure that the yield is increased, without varying the composition of the ingredients,i.e.enzymes involved in yielding your product? ls answer with logic behind the mechanism.Or just tell the underlyning principle of chemistry behind it.

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