‘We should blog twice a week’ settles the frequency before establishing the purpose. Start with a question your customers actually ask and the explanation your business can credibly contribute.
A blog is useful for considered perspectives, practical teaching and questions that deserve context. A service page may be better for explaining your offer. An FAQ can answer a narrow operational question. A case study can demonstrate how you handled a real problem.
Check what already exists before creating something new. Improve a useful but dated article. Combine overlapping pieces. Retire material that is inaccurate or no longer serves a purpose, with appropriate redirects where needed.
Plan distribution and maintenance alongside drafting. A strong article can support sales conversations, newsletters and relevant internal links. Without a route to readers or an owner for updates, it can become another neglected page.
Measure the job it performs. Did buyers arrive better informed? Did the piece support an enquiry or reduce a repeated question? Traffic alone cannot tell you whether the investment was worthwhile.
Publish when you have something useful to add and the capacity to maintain it. There is no universal weekly quota that makes a blog valuable.