Ash here from the Shopify team.
It sounds like you're looking for a few more days in your trial period to get the shop ready before committing to a paid plan. I'm happy to look into the possibility of this with you! I've sent you an email to the email address associated with your Shopify Community account. Please reply back to that email to let me know your .myshopify.com URL, and once we complete authentication through that email, I can take a closer look into this with you. I look forward to receiving your reply!