If you are not able to shrink tempdb execute below query and try again

  -----If you are not able to shrink tempdb execute below query and try again

USE TempDB

GO

--Use below query for clearing plan cache in the server.

DBCC FREEPROCCACHE

go

--Use below query for clearing buffers from bufferpool.

DBCC DROPCLEANBUFFERS

go

-- Use below query, this will Releases all unused cache entries from all caches.

DBCC FREESYSTEMCACHE ('ALL')

go