This approach uses a custom Text field which stores values of multiple other individual fields. Then enabling field history tracking of this field would allow you to track changes for multiple sets of other individual fields, instead of enabling field history tracking for 3 fields - Email, City, Phone- the only field which needs to be enabled for history tracking is the custom field - track3Fields.
This way you are able to track changes for 3 fields by consuming only 1 unit of the total 20 limit.
Steps:
Step 1: Add a new custom field.
Setup -> Create -> Objects-> Incident
Create a new Text (255) field “track3Fields”
Step 2: Create a workflow on Incident object with the following:
Event: On Create/Update
Criteria: On any change of Email, City, Phone
Action: Field Update
Set track3Fields = Formula (Email: <Email> + City: <City> + City: <City>)
Step 3: Enable Field History tracking for this combined field “track3Fields”.
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