Always use custom descriptions when submitting to directories. For a long time I re-used descriptions that I wrote and realized over time that eventually those listings became worthless.

It's not enough to rotate between 3-4 descriptions...you can re-use the same general idea, but always write it in your own words when you're filling out the submission form.

Use a short title description, about 2-3 words (2 is better, but 3 if you need it to demonstrate the title of the site). Do NOT use more than 4 words in a title. It will simply be seen as spam.

Always spell check your submission. Don't write it in English if English is not your first language.