This strategy requires that you search for directories that are not yet heavily exploited, reliable and of quality. However, it must be done with caution, manually, periodically and progressively, to avoid being considered by search engines as a bot.
The idea is that you use directories that are related to the theme of your website and take into account the following:
If you use the same directory, do not always submit the same page, try to vary the anchor text and addresses.
Check the link and anchor text to make sure it is correct, otherwise it could affect the positioning of the website.
Pay special attention to details and remember that quality far outweighs quantity, so it is better to send well-crafted links and not exaggerate the number.