SQL Server Express conection string - sql-server

I'm trying to connect to a local SQL Server Express database using EF Core with this connection string:
"Server=(localdb)\\WIN-R84DEUE96RB\\SQLEXPRESS;Database=rmcsql;Trusted_Connection=True"
I get this error:
fail: Microsoft.EntityFrameworkCore.Database.Connection[20004]
An error occurred using the connection to database 'rmcsql' on server '(localdb)\WIN-R84DEUE96RB\SQLEXPRESS'.
fail: Microsoft.EntityFrameworkCore.Query[10100]
An exception occurred while iterating over the results of a query for context type 'RMC_IEM.DataStore.EF.ApplicationDBContext'.
Microsoft.Data.SqlClient.SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SNI_PN11, error: 52 - Unable to locate a Local Database Runtime installation. Verify that SQL Server Express is properly installed and that the Local Database Runtime feature is enabled.)
What is wrong with this connection string?

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TITLE: Connect to Server
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ADDITIONAL INFORMATION:
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I'm pretty sure that my computer or server is name is NUNA but it doesn't connect and I get this error. I have tried to stop SQL Server Express in Windows Services, but it doesn't show the SQL Server Express
Did you try restart SQL Server service or try with "."?

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TITLE: Connect to Server
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A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 2)
I run the command ipconfig/all and I get this:
What I should do next?
Thanks!

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I tried many things Adding port 1433in firewall but still it is showing the below error.
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ADDITIONAL INFORMATION:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - No connection could be made because the target machine actively refused it.) (Microsoft SQL Server, Error: 10061)
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