Lulu here from the Shopify Support team. Thanks for reaching out here, and I'll be more than happy to help you out.
As you are using a free Shopify theme, this may be something our themes team can help you out with by using your design time. (Read more about design-time here). Can you forward on a screenshot of the exact section you are looking to change and can you also let me know how much bigger you are looking to have the font?
Also in order to check your eligibility, I will just need to verify your account. I will send you an email to the email address attached to this forums account and confirm some security questions about your store. Once you reply to that email, I will get that done for you.
Lulu | Social Care @ Shopify
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