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For fields such as Job Title, an easy solution and best practice is to make of this field a Picklist. This way you will restrict the options the user can select and massively improve your data quality and ability to segment your database.
For fields such as Phone, just use the right field type. In this case, select 'Number' as a field type and Marketo will automatically give you an error message if the user fills this field out with other type of data:
For the rest of the fields, probably add a message explaining the importance of getting real data.
Hope this helps you!