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The below official article has many ways,
https://developer.salesforce.com/docs/atlas.en-us.communities_dev.meta/communities_dev/networks_migrate_overview.htm
You can choose from them.
This one is just for reference (https://salesforce.stackexchange.com/questions/275100/moving-changes-from-one-organization-to-another).
I hope you find the above information is helpful. If it does, please mark as Best Answer to help others too.
Thanks.