Keep these in Mind.
The default endpoints provided by Keplr Infra are optimized for performance and quality. Changing these to external providers might result in unexpected issues or data fetching failures. If you encounter problems after changing the endpoints, contact the endpoint providers directly for support. They are responsible for addressing any issues related to their endpoints.
Open Keplr Extension in your browser and go to [Settings] from the bottom navigation bar.

Navigate to General > Advanced > Change Endpoints.

Select the network you want to update, edit the RPC and LCD endpoint links, and click [Confirm]. Ensuring that the URLs are accurate is crucial.

If needed, you can reset the endpoints back to Keplr Infra’s defaults by clicking on the “Reset” button. This can help quickly resolve issues arising from endpoint changes.
Always proceed with caution and consult with endpoint providers if you face any difficulties.