No interview calls

this system worked for me very well to get calls.

Go to LinkedIn.
In search, put "<job title> hiring".
Select "Past 24 hours" filter.
Find a post you like, research company.
If you like it, apply in their given method (email, link etc).
Send a connect request with note to the person who posted the opening.
They may accept or ignore but they will see your profile.
So keep a stellar profile, highlight wins, portfolio and achievements.

This method has advantages: You'll definitely be among the first applicants. You'll jump ahead of many lazy applications.
You're directly getting the eye balls of the recruiter (a person instead of a computer).
If they accept your connection, share your phone number and get the ball rolling.

After that it's your communication skills and talent. Good luck my friend.

Cloud , python , paas , ci/cd
But I have not got a single call

You are from PBC you will definitely get calls

Tech stack?