Open Rates Sinking - Need HELP Asap

Hello,

I am reaching out to all you experts in hopes of receiving some constructive feedback. I started in my position about 3 months ago. We have one big newsletter than is broken down into 3 different versions that gets sent out at the beginning of each month, it is called "Titan Tracks". Now, I have all the data from 2019 - until current so I can see trends, but I can also see a slow decline in open rates / CTR through that time period as well. Here is some data from 2020;

As you can see, we delivered around 11,000 emails and had a 30% open rate and a 40% open rate. These are the numbers I WANT to see.