A WooCommerce store is not something you build once and leave. WordPress, WooCommerce and the plugins for payments, shipping and invoicing get updates every few weeks. If nobody keeps an eye on them, sooner or later something stops working: the payment gateway, shipping cost calculation or order emails. And every hour the store does not take orders is real lost revenue.
A WooCommerce maintenance plan solves that. Every month I update WooCommerce, WordPress and the plugins, and then check that the whole checkout flow works. On top of that you have a fixed pool of hours for store support: changes, fixes and development. I have worked with WooCommerce for years, I do migrations, integrations and custom WooCommerce plugins, so I know where stores break most often.
I work remotely with stores across Europe. I am based in Warsaw, so I work and reply during business hours in the CET time zone.