I’ve request to upgrade my instance to production grade and done now. Is there any way to connect my upgraded server with ssh terminal?
You can not connect with ssh to your server, you can connect only directly to the mongo db instance from that server:
https://docs.moralis.io/moralis-dapp/database/direct_access#connect-directly-to-the-mongo-db-instance-that-runs-on-your-moralis-server