It is absolutely necessary. If you don't send your resume to the enterprise, how will others know about you, and how will you know whether you meet the job requirements of others? Most importantly, the company doesn't know that you are looking for a customer service position to call you. I suggest you go to Xiaoxiang Talent Network or Hunan Talent Network. There are many companies recruiting customer service positions now. If you want to send your resume, you can call the interested company directly!