Focus means doing something, with a single point or objective in mind,
Zen12 Review and not allowing any distractions. I well understand this is very much easier said than done, but to allow even a short burst of time, like fifteen minutes of intense focus can be more productive than two hours of unfocused work.
Even though I have advised that you make lists, keep an eye on the amount of work you plan for each day, and monitor the amount that gets done. If you are able to keep uo, that is excellent. If you are regularly noticing your list is getting longer and longer, you can do one of two things. You can either delegate, if you are able to, or rather, plan to achieve less, which can actually be more.
I say this, as the frustration if not achieving your goals can leave you feeling unaccomplished, or you may end up rushing, and doing noting as well as you might otherwise. Hence, monitor, and adjust as necessary. You may even find that the improved focus exercise above, helps you achieve more in less time, which is the aim.
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