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Here are some steps to resolve a 504 Gateway Timeout error when deploying Django on AWS Elastic Beanstalk:

1. Check the health of the instances: First, check that the instances are healthy and running. Go to the EC2 console and check the status of the instances associated with the Elastic Beanstalk environment.

2. Increase the timeout period: Elastic Beanstalk uses a default timeout period of 60 seconds. If the request takes longer than 60 seconds, you may get a 504 error. Increase the timeout period to give the request enough time to complete.

3. Optimize the code: Check the code for any performance bottlenecks or slow database queries. Optimize the code to make it more efficient and faster.

4. Add more instances: Adding more instances can help distribute the load and improve the overall performance of the application. You can add more instances from the Elastic Beanstalk console or by using an auto-scaling group.

5. Scale vertically: You can also try scaling vertically by increasing the instance type or adding more CPU and RAM to the instances.

6. Check the logs: Check the logs for any errors or warnings. Fix any issues that may be causing the error.

7. Use a CDN: Consider using a content delivery network (CDN) to improve the performance and reduce the load on the instances.

8. Contact AWS support: If none of the above solutions work, contact AWS support for further assistance.