That limit is controlled by PHP, not WordPress. In order to accomplish this, you must have some experience with php.ini, .htaccess, or basic PHP programming. It’s important to note that it’s up to your hosting company to “allow” you to modify the upload file size. Here is a good page that explains all this:
https://www.wpbeginner.com/wp-tutorials/how-to-increase-the-maximum-file-upload-size-in-wordpress/
If none of these tricks work, you’ll have to contact your hosting company and see what they allow for php.ini modifications.
