Can I shift second-level headings up one level to display as third-level ones in the HTML output?

Thank you. I have the title of the website as H1, and as far as I know, it’s not good to have multiple H1s on a single page. H2 is for section titles like “Blog Posts,” which is why I thought it’s better to start with H3 when it comes to the content. That way, it follows the order.