Weekly
Check Google Business Profile messages and reviews. Answer both. Post one update if you have something real to post. Skip the post if you don't. Empty posts hurt more than missing posts.
Monthly
Run a listings audit across the five or six directories that matter in your category. Fix name, address, phone, and hours mismatches. Publish one piece of content tied to a local term you actually get asked about.
Quarterly
Run a technical check: Core Web Vitals, structured data, internal links, crawl errors. Review your top five keywords and decide whether to double down or replace one.
What to measure
Rankings are a lagging indicator. Leads, call volume, and direction requests from GBP are the leading indicators. Track those weekly and you will feel rank changes before the tool reports them.