Currently My site URL is "https://team-1614231928251.atlassian.net/" and I want to change it to "https://testrobomq.atlassian.net"
If you were on a commercial licence, you could raise a support request for Atlassian to change it.
As you're on a free version, that option is not available. You will need to subscribe to the new Cloud system, remembering to choose testrobomq as the name for it, then export your data from your current system and import it into the new one.
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