Are you tired of creating multiple store just to test out Shopify ?
By normal, Shopify restrict the Store to be only 14 days trials before you have to pay for the subscription.
I'm a Shopify Partner and Shopify Certificated Expert therefore I can create for you trial store without any date limitation which means you can have plenty of time to work with your dream store and only pay for Shopify when you are ready to go Live
I also can help you with getting free premium themes and setup store for you. Checkout my other gigs to know more