Hello @Rahul Wattamwar Welcome to the community.
BY and username don't work together. However, it works by placing the user id. your query should look like this. You need to change the username by user id.
status CHANGED by 557058:36489d87-6c0f-4d2b-9862-5145432a647d
You can check the user id by navigating to Admin>User management>Users and hoover on the user you want to add to the JQL.
As the user id is long and convoluted you can open a new tab and copy the last set of numbers/letters after .../users/
Atlassian changed things about the username in Cloud you can look here: Update your profile and visibility settings | Atlassian Support
I hope it will help you!
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@Rahul Wattamwar Please accept this answer so that others can consider it a solution.
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