You are right, trends in web design change very quickly, so in order not to become the owner of an outdated site, you need to periodically update the design and improve the architecture of the site. If you don't understand anything in this, then you can always find qualified assistance in outsourcing B2B companies. For example, I recently found the site of
KWD New Zealand company that provides a professional quality web design service. I think I should contact them soon, as at my site hasn't changed the landing page for over two years.