When you understand the uniqueness of every person in your database, you can respect those differences - personalising emails, and even website pages - transforming your results.
What information could you gather on forms/chats would improve communication with customers?
What additional information could you turn into Contact properties, and then use via personalisation tokens in emails?
Think about how you use LinkedIn (if you’re B2B) - could you add additional information into HubSpot that would help deepen the relationship?