There is little prospect in this line of work. The best I can do is to be promoted to the leader of the telemarketing department, and this leader is basically responsible for recruiting people.
It is suggested that if you want to do sales, you should do it down to earth. If you are a girl, start with FMCG, targeting store managers and managers. If it is a boy, start with the insurance and advertising industries, with the goal of marketing and planning.