Email Marketing Help

i have an opt-in list of email addresses, but i'm struggling to get folks to open the newsletter i send them, and then click the links on the email. i need help trying different from email addresses, subject lines and email body text. if you have experience with this, i would like to try your methods and suggestions on a test group of emails to see if you can improve my results. (Nice to Have) Your areas of experience: - Create email marketing strategies and campaigns to reach out to new users and reengage existing customers - Compose email-friendly designs following best practices for customer acquisition with our team. - Compile reports and analytics using key success metrics - Identify and develop promotion strategies for new products, features and announcements - Conduct market research and competitive analysis - Manage email and database marketing tools