I shouldn't have got a PhD. I am not suitable for research in my field. How should I proceed?
This sounds like classic Imposter Syndrome combined with end of degree burnout.
What you are feeling is natural, but having a bunch of papers published seems to imply that this is emotional and not a substantial issue.
The job market in many fields is terrible at the moment. Some of the issues in finding a good position are external and will hopefully subside before too long.
I suggest that you talk to a counsellor about your feelings and also push hard in the job market using all available resources, such as your advisor, etc.
Both the feelings and the job issue will pass if you don't let them affect your sense of self-worth.
Depth will come. You have proven that you can learn. The end of your formal education isn't the end of your education.