The cheapest approach is to take a break for a little while, then come back and re-read what you just wrote. Is it well-organized? Is anything phrased awkwardly

The cheapest approach is to take a break for a little while, then come back and re-read what you just wrote. Is it well-organized? Is anything phrased awkwardly? Are there parts you can tighten up without losing anything? Just taking the time to do this can make a huge difference in the quality of your writing.