re: "I do not get any proposals for the job that I have posted."
I have hired over 100 freelancers on Upwork. Often I post jobs and hire VERY quickly, even for very technical, complicated projects. When I say quickly, I mean that I often will post a job, get responses, and hire people within 15 to 30 minutes.
The freelancers are out there.
But it sounds like you have posted a job and nobody is sending proposals?
Tell us more about what type of work you are hiring for?
Did you post this as an hourly or fixed-price contract?
How long ago did you post your job?