You can get all the CMS Static Blocks collection in Magento 2 by calling interface, Magento\Cms\Api\BlockRepositoryInterface.
Magento\Cms\Api\BlockRepositoryInterface used for getting CMS Static Blocks related data in Magento 2.
BlockRepositoryInterface is used when you need to fetch a collection of CMS Static blocks or get specific CMS static block data. You can get Specific Blocks data by Identifier using Get Cms Blocks data by an identifier.
How can we add filter and sorting in the block collcection?