Analyze your audience and choose your Call-to-Action based on what your audience sees as valuable. And especially make it easy for them to convert. A big part of this is making your emails mobile friendly, as there are many clients opening your emails on their phone. Some options for Call-to-Actions include but are not limited to:
• A sign-up link
• Product upgrades
• New products
• New deals
• Free content guides
-Vendasta June 2019