Help me to select best option for my next shop

hello every one,
I have one woocommerce online shop with 3000 products and 5000 daily hits. but it need more and more resources day by day, so i want to create my next and same online shop with other platform.
also i am a developer, have some projects with php and codeigniter and some experience with symfony, so i like sylius.

also i will new to create mobile app for my shop, so i will need good API framework. and also will need a base framework with good level of customization ( i like semantic ui too).

but i think there is somethings missing in sylius. for example icould not find how i can sell digital product in sylius or how i can get on sale products.

my question is, SYLIUS IS GOOD OPTION FOR REAL SCALABLE ECOMMERCE SHOP?

my main products will be shoes. and i need to integrate my own web application with this shop. could you please help me?