The first step to improving your data is to understand how it maps together. If you don't do that, tools like the Modern Data Stack won't be very much help. Read more in "Everything Starts Out Looking Like a Toy" #97
Data Unification is the key!
This post reminds me of an article I'd written for the HubSpot blog titled How to Validate Data Between HubSpot CRM and an Email Marketing Tool: https://blog.hubspot.com/customers/validate-data-hubspot-crm-email-marketing-tool