There are a few different membership plugins that would allow you to extend WooCommerce’s default/free functionality restrict content to paying members.

WooCommerce Memberships is a popular option from the WooCommerce.com marketplace,for example. You can find more details on this extension, as well as its documentation, here:

• https://woocommerce.com/products/woocommerce-memberships/
• https://docs.woocommerce.com/document/woocommerce-memberships/

You can also search the web for “WooCommerce membership” to find other options. Before selecting a plugin, I highly recommend making sure it comes from a reputable source and taking into account factors like reviews, support, etc.

Hope that’s helpful!