Hi @abhimanyu pawar ,
What is the version of your SSMS and SQL Server? When you have tried all available ways:https://learn.microsoft.com/en-us/sql/ssms/scripting/troubleshooting-intellisense?view=sql-server-ver15
You'd better use the latest version of them
Wheather you have enable IntelliSense? Please check Tools>Options>Text Editor > Transact-SQL > IntelliSense
For each opening query window, please go to Query >> Intellisense Enabled.
Enable statement completion: please go to Tools >> Options >> Text Editor >> Transact-SQL >> General, and check on Auto list members and Parameter information boxes.
https://social.msdn.microsoft.com/Forums/en-US/cc07c837-5729-4c38-9f4f-3e9cba02af82/intellisense-autocomplete-wont-work-on-ssms?forum=sqltools
Is SQL Server installed on the same machine as your SSMS? When you connect to remote server, Intellisense may not work well
It could also be because over VPN is adding enough latency that it is disrupting IntelliSense
https://dba.stackexchange.com/questions/278227/intellisense-not-working-over-vpn
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