Question:
Which plan are you using Core or Business ? I need to be able to send more emails, do I just add marketing to my Core plan or upgrade to Business?
Product:
Wix Plans
What are you trying to achieve:
Best pricing.
Email Marketing plans are separate from your Premium plan.
This article outlines the Email Marketing plans and their quotas - which should help you choose the one most relevant to your use case. You’ll simply need to upgrade to the plan that fits your needs 
- Email Marketing: Upgrading Your Email Marketing Plan | Help Center | Wix.com
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Can you add an email marketing plan to a Studio plan? The email plans seem to refer to the tiers for the Premium (non Studio) plans instead.
Email Marketing plans are separate of both Wix and Studio plans. They’re purchased per site.
For example, if you need to send 50K+ emails on a Studio site, you’ll need to upgrade the email marketing plan for it
You can keep your Studio plan and just buy an email marketing plan on top.