Increase the size of font backend wordpress

Try this:

function custom_admin_styles() {
	echo '<style>
    p, div { font-size: 102% !important; }
    div > p, a { font-size: 100% !important; }
  </style>';
}
add_action('admin_head', 'custom_admin_styles');

You might adjust it on your own needs.

Have you tried a plugin? This one might help

Thanks guys!!!!