Hey Meghan. I ran into something similar recently.
A few things that improved results for me:
Warm up domains gradually and avoid ramping volume too fast
Keep the first email plain text with low link density
Segment harder, smaller, more relevant lists tend to perform much better
Avoid catch-all emails even if they’re marked as 'safe.'
Personalize the opening line enough that replies feel natural, which helps positive engagement signals
Also check SPF, DKIM, and DMARC alignment if you haven’t already
One thing that made a surprisingly big difference for me was tightening targeting instead of tweaking copy endlessly.
