You should plan to review your website or service’s accessibility on a regular basis, and update your statement regularly (when there are major changes and at least once a year). You should keep a record of your audits and progress made against them.
It's important to note that not all accessibility requirements or good practice can be met by managing the back end of the website or using automated checks. All website editors play a role in ensuring that we continue to create content that is suitable for all our users, whatever their needs. Continued attention is required to small but important elements like good alt text, clear link text and succinct and simple language. If you are responsible for training for your website or service, you should consider how to ensure editors/users are kept up to date on best practice.