Adjusting UTM Attribution in Mixpanel for Accurate User Source Tracking

I have a question regarding Mixpanel's UTM parameter attribution. For example, when we analyze the UTM Source, if a user arrives through a paid campaign with UTM parameters in the URL and then returns through an organic source without any parameters in the URL, Mixpanel still attributes the UTM Source as paid. How could I mark this user as organic in such cases?