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Using Trigger Lead Assignment in Round Robin Manner.
Write a Trigger to assign leads in a Round Robin manner. Create a Queue & add 3 users to it. Whenever a lead is assigned to that Queue, Reassign the Lead to one of the Users in the Queue in a record robin manner.
Please refer below links which might help you in this
https://www.shellblack.com/administration/create-a-round-robin-lead-or-case-assignment-rule/
https://help.salesforce.com/articleView?id=pardot_users_create_group.htm&type=5
https://sfdcpanther.wordpress.com/2017/09/03/round-robin-assignment-using-trigger-and-workflow-rule/
Hope this helps you
Let me know if this helps you. Kindly mark it as solved so that it may help others in future.
Thanks and Regards
Here is a solution we have created that is available on the AppExchange - SuperRoundRobin:
Supports any standard or custom object with an OwnerId, including Lead, Case, Account, Opportunity...
https://superroundrobin.com
https://appexchange.salesforce.com/appxListingDetail?listingId=a0N3A00000FR4MkUAL
Best wishes