Currently, the only way to allow guest checkouts is by having two buttons on the cart - one leading to a sign in page, and one leading the user directly to checkout without signing in. This is different from the way other platform cart pages function, and most customers click the first button they see, which means that to get to the guest checkout they have to backtrack and find the guest checkout button.

In order to reduce friction in this process, t would be better to mirror the path of other platforms. Make one universal 'checkout' button on the cart; that leads to a 'sign in' page (if the customer is not already signed in), where they can either sign in, register, OR continue checking out as a guest.