0 response out of 10 is normal. Usually I get an influx of 4-6 invitation over 20 applications, or even as little as 0-2.

Recruiters give better chance to land an interview since they have direct contact with company, and afaik usually company will prefer to process recruiters candidate first.

Job application is a numbers game, just keep applying and get as many interview as you can. I thought I even got lucky landing on current job in 3 months looking.