esc_html Line break

You are using single quotation in single quotation which is not possible, use one of the below approch,

Approch 1 (' \' '):

'post_alert_user' => esc_html__('Thank you for your submission at ', 'usp-pro') .$user['admin_name'] . esc_html__('! If submissions require approval, you\'ll receive an email once it\'s approved.', 'usp-pro'),

Approch 2 (" ' "):

'post_alert_user' => esc_html__('Thank you for your submission at ', 'usp-pro') .$user['admin_name'] . esc_html__("! If submissions require approval, you'll receive an email once it's approved.", 'usp-pro'),

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