WordPress runs a large share of the web, which makes it a target. Most problems come from plugins and themes that were never updated. Keeping them current, with backups before each update, prevents most issues before they start.
Maintenance also keeps your site useful. New project photos, updated service areas and fresh reviews help your site convert, and they are exactly the changes that get put off when you are busy running jobs.
Business website packages include 3 months of free maintenance. It pairs well with local SEO, which relies on a fast, healthy site.