Checkout not working when im upgrading from Magento 2.3.0 to 2.3.3

Like the title says, Ive been trying to upgrade my version of Magento from 2.3.0 to 2.3.3 unsuccessfully. The checkout stops working as soon as Ive upgraded and Im not sure what the problem is since Ive already tried a lot of stuff.

Any ideas? Are there any changes between the versions that are substantial and require something special to be done?

submitted by /u/whatthebitchsaw
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