Some info that would be helpful to understand your situation more:

- which country are you based in? (each country's job market is wildly different); are you native of that country?

- do you apply in response to job ads, or find companies you like and apply even if there are no openings?

If I can advise something regarding no responses: finding a recruiter (on LinkedIn etc.) and talking to them directly might yield better responses than applying via a blackbox website (although this is just my gut feeling).