Want to execute all the threads parallelly in JMeter

I don't think your setup is correct, the Parallel Controller executes its children in parallel, it means that

1. "User 1" will be executed first and all these requests like Retrieve bearer token, retrieve country details, etc. will be executed at exactly the same moment so if retrieve country details requests needs the token - it will fail
2. "User 2" will be executed after "User1" completion

So I would recommend:

1. Get rid of the parallel controllers (unless I misunderstood something and all these 5 requests really need to be executed at the same time)

2. Get rid of these User1, User2, etc and instead parameterize your test using i.e. CSV Data Set Config so each JMeter thread (virtual user) would get its own credentials from the CSV file

3. Define the required amount of threads (virtual users) and loops (or test duration) on Thread Group level

   

   this way JMeter will start 5 threads (virtual users) in parallel and they will be executing Samplers for 100 iterations or 300 seconds