Let's be honest, design trends change fast. If your website looks like it's stuck in the early 2010s (or worse, the 2000s), it's time for an update. Customers judge your business based on your site's appearance, and an outdated design can make you seem less credible or trustworthy.
Think about it. When was the last time you updated your site's look? If you can't remember, it's probably been too long.