Hi @linndaa - Welcome to AWS QuickSight community and thanks for posting the question. There is NO out of the box solution exist for your requirement, however you can create a lambda function and using boto3 QuickSight APIs , cloud trails and SNS you can communicate the users ( if they have not used QuickSight for 90 days) via SNS and then for users who do not have any activity for 90 days, you can delete it.
Note - I have not tried this from my end but this is something you can explore using QuickSight APIs
- Link for all QuickSight API details:
https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/quicksight.html
- Find one such similar post - Quicksight login user track
Regards - Sanjeeb