The frequency of updating the keywords for your plumbing website depends on several factors. These factors depend on the level of competition for the keywords, changes in the search trends, and updates to your services.
In general, it's a good idea to review and update your plumbing website's keywords at least once every three months. This allows you to stay up-to-date with changes in search trends and adjust your SEO strategy accordingly.
When updating your keywords, it's important to focus on high-value, relevant keywords. Long-tail keywords are more specific phrases that are less competitive but can be highly valuable in driving traffic. A combination of both types of keywords will help your page rank better and generate revenue.
It's also important to avoid overusing or "stuffing" your website with too many keywords. The reason is that it can hurt your SEO performance and make your website appear spammy to search engines.