Hi Jeremy,
This is Arul an expert in email deliverability, go through my profile for more details. I could plan your warmup strategy from the scratch till ramp up your whole volume. But before that have your White listed your IP at which ISP accepts. I have a checklist, that needs to be signed off before starting our email marketing with warming up IP and domain.
Also there are some best practices in terms of domain. I would like to review your account and make sure it is ISP friendly to deliver messages to inboxes.
Let's talk more in chat
Regards
Arul