Websites do not break all at once. They fall behind quietly: a plugin left un-updated, a contact form that stopped sending emails, a backup nobody has ever tested. And the problem shows up on exactly the day an important client arrives.
1. Updates, even when nothing seems to change
Most hacked websites were never chosen as targets: they were running an old version that a bot found on its own. Updating WordPress and its plugins is dull, and it is what protects you most. With a backup first, in case an update takes something with it.
2. Backups you can actually restore
Having a backup is not the same as being able to recover it. It is worth testing a restore now and then: it is the only way to know it exists and works. A backup nobody has ever opened is a promise, not a guarantee.
3. Make sure the forms still arrive
This is the quietest failure of all. The form looks fine, the visitor sees the thank-you message, and the email goes nowhere. Send yourself a message through your own form once a month: it takes a minute and saves you from losing clients without knowing.
4. Broken links and pages left behind
You change a service, delete a page, and links keep pointing into thin air. Not serious, but it looks careless and Google notices. A quick review every so often keeps the house in order.
The bottom line
Maintenance is invisible when it is done well — you only notice it when it is missing. Half an hour a month prevents almost every scare, and the ones it does not prevent find you holding a recent backup.