First of all you have to add new remote in your cloned forked repo

git remote add <new_remote_name> <your_repo_url>

Next, you have to fetch changes from original repo:

git fetch <new_remote_name>

And finally you can sychronize new changes using f.g. rebase:

git rebase <new_remote_name>/<branch_you_want_to_synchronize>

Useful resource: How to update a forked repo with git rebase

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