Cal here from Shopify, thanks for reaching out to us.
The 90-day free trial was available as a response to the Covid-19 pandemic and is no longer available for new merchants. However, I'd be happy to take a look at your account, and look into extending your trial time by a further week in order to help with getting your store setup.
Can you share your MyShopify URL for the store? Has something in particular been slowing you down with store setup that I can assist with?
Thank you for that. I've emailed the account owner on file with more information on this request.
Best of luck with designing the store! Let us know if there's anything else we can assist with.