Dividing the responsibility between Sales and Marketing in influencing revenue

"High revenue thanks to Sales, low revenue in Marketing" – does this saying sound familiar? Sales are often considered the main players in increasing revenue, because they directly transact and close orders. Meanwhile, Marketing is often "blamed" every time sales go down, because it doesn't generate enough leads or the content is not attractive enough. But what is the truth? Both departments are important "links" in revenue. If Sales and Marketing are not closely coordinated, it will be diffic