Email lists can shrink as members opt out of email subscriptions and grow as the business solicits contact information from website visitors. Use varying types of email subscriptions to send more targeted content to specific segments of your marketing personas. Though it might seem counterintuitive to remove folks from your email lists to grow them, emailing only engaged contacts could improve your deliverability and increase the odds of your email getting shared with those outside your current contacts database. Plus, if you are already in a natural email conversation with them, subscribing to more emails can be a natural next step.
You can read more here: https://blog.hubspot.com/blog/tabid/6307/bid/32028/25-clever-ways-to-grow-your-email-marketing-list.aspx
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath