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The next step is to determine what is causing the difference between the current performance and your performance goal. You need to understand the subsystems that have an influence on being able to achieve this goal. Begin with a hypothesis, that is, your best informed guess, of the factors that are critical for moving the system toward the goal. You can then use this hypothesis to make adjustments to the system on a trial basis.
If this approach is used then you should maintain a record of adjustments that you have made. You should also keep all the data files produced with the various monitoring commands such as timex(ADM), and sar(ADM). This is useful when you want to confirm that a side effect noticed after a recent change was caused by that change and did not occur previously.