How to fix: Class from deleted module does not exist (Magento 2.3)

You have to delete the attribute which is created from the remove extension(3rd party extension).

Magento saves the attribute basic related at database table eav_attribute.

So you have to run below query for identifying that attribute

SELECT * FROM eav_attribute WHERE source_model = 'MageWorx\SeoBase\Model\Source\MetaRobots'.

You have to delete this attribute from database.

After that flush cache.

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