Hello @LauraL297 ,
It looks like the majority of your bounces in your latest sendouts are "blocked" types.
For more info on managng bounces
You may want to look into setting up additional authentication for your emails - particularly self-authentication since you have your own domain, as that's what might be causing internal emails to block you sending through us.
If you'd like to learn more about safelisting, and what it entails:
If you're wanting more in-depth, specialized insight on your current deliverability, it'd be worth speaking with one of our Deliverability agents.