Try one last time to convert your prospects by using breakup emails.
The breakup email is one of the most effective follow up email you can use when a prospect isn’t responding to your emails.
You’re essentially making it clear that they won't hear from you again. By being the one who’s walking away, rather than the one who’s pursuing, you turn the dynamic of the interaction around.
It works both for outbound emails (when you’re sending emails to people who have never expressed an interest in your offer or interacted with you) and inbound emails (when you’re sending out emails to people who have at some point expressed interest in your offer, e.g. by signing up for a trial).