Hello @Bhm20-16 ,
I'm sorry to hear you've been experiencing a decline in your open rates. From what I can tell your contact numbers and send-outs have remained steady, and you don't have a large number of bounces. At this point I'd recommend reaching out to our Deliverability team for further insight and guidance. One thing I know they'll mention is the continued use of the Legacy email builder. By default, the new editor has much better open rates because its emails are coded to be mobile friendly.
It is entirely possible that there are additional elements causing the sharp decline in opens, so I'd still recommend talking to Deliverability.
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