A few quick suggestions and then a, what I hope, will be a big one.
The decrease in engagement could be due to many factors, but if I had to pick 3 top issues you might want to address;
1. Length. Attention spans are now counted in seconds. The more scrolls someone has to do, especially on mobile, the less likely they are to take action in this email, and open a future one.
2. Choices, the more options you give people, the less likely they are to take any action at all.
3. Reliance on images. While images are great, too many can overwhelm the reader. Also, images are often blocked, so if the entire message is relayed in a small image, and that image is blocked, you might miss out on reaching your members.
4. BONUS: use buttons rather than hyperlinks, most readers are reading on mobile, and buttons are easier to push than hyperlinks
I'd highly suggest you check out a webinar I held for Chambers not too long ago. I share many tips that might help you.
Good luck, let me know if I can help you future.
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