Research and evaluate products available on AppExchange to send mass emails is the action that the app builder should take to meet the requirement of broadcasting an email to 7,000 contacts in Salesforce on a regular basis. AppExchange is a marketplace where app builders can find products or solutions that can extend Salesforce functionality. There are many products on AppExchange that can send mass emails without hitting the Salesforce limit. Request Salesforce increase the number of maximum daily emails, develop Apex code and Lightning web component to send daily emails, and export Contacts to a CSV file and use an email client to send the emails are not valid or recommended actions.