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Nidhi GautamNidhi Gautam 

How to change my Professional edition account to Developer Edition

SwethaSwetha (Salesforce Developers) 
HI Nidhi,
End users do not have access to change the Editions of orgs. You will need to contact Salesforce.com Support or reach out to your account executive.
Link: https://help.salesforce.com/articleView?id=workcom_contact_support.htm&type=5

However, as a workaround, end users can deploy to other editions considering the governor limits.

Similar posts from past :
Https://salesforce.stackexchange.com/questions/43926/how-do-i-change-the-edition-in-a-developer-account
https://developer.salesforce.com/forums/?id=9060G000000UTzxQAG

If this information helps, please mark the answer as best.Thank you