The "MultiVariants - Bulk Order" app also works for non-variant products to set restrictions. If you want to set a minimum order limit on a product in your Shopify store, then It is possible with the  "MultiVariants - Bulk Order" app. This feature is available in the “Professional” package.

To get the feature, install the "MultiVariants - Bulk Order" app in your Shopify store and follow the procedure:

•   Navigate to app admin and click “Set Restrictions”.
•  Here you will see “minimum quantity” in the Quantity restrictions section.
•  From there, you will see an option named “Total (combinations)”.
•  Now in the input field enter your minimum order quantity for the product.
•  Save the configuration and check it on the product page.