I want to increas my site image [closed]

In the ‘additional CSS’ section of your theme customization area, try this CSS

.rsrc-header-img {width:500px;}

…changing the width value as needed. If your theme doesn’t have an ‘additional CSS’ setting, there are plugins that will add that to your theme’s customization page.

Or, you could create a Child Theme, then put the above CSS in the styles.css of that Child Theme. (You don’t really want to change styles.css in your main theme, as any changes will be overwritten on a theme update.)

If the above CSS doesn’t work (because the class name is not working), use your developer tools to highlight the <img> element, then look in the CSS inspector to find the sub-class used for that element. (Maybe you need to use the .rsrc-header-image.div.img in the CSS.) You can even change the values in the CSS inspector panel of the developer tools to try out different values.