Option : Use a Suggested Audience

Analytics also provides a number of fully configured audiences that you can use as is or modify if necessary. These suggested audiences are based on the categories you specify for your apps in Apple's App Store and in Google Play and on the industry category you specify when you configure a property. Learn more

For example, the Recently active users audience is defined as follows: Include Users when (event =) user_engagement

You can use the audience as is, or you can add conditions or sequences, or change the membership duration as necessary.

Use the default name or enter a new name, then click Save. For information on working with suggested predictive audiences, see Predictive audiences.