First of all, as long as your basic requirements meet the recruitment requirements of the recruiter, you should wait patiently after submitting your resume, and don't be too impatient.
There are many reasons why recruiters don't reply to your information. For example, there may be too many candidates who submit their resumes after the school sends out the recruitment notice. So the person in charge is reading your resume carefully and screening out some resumes that they think are satisfactory for the interview.
So, since you added the person in charge's WeChat, he didn't inform you that you were unsuccessful. You can choose to ask the person in charge about a week after submitting your resume, whether they are satisfied with your basic conditions, whether they can take part in the next round of written test and interview, make preparations in advance and get excellent results. If you are short-listed, he will inform you to go to school for the next round of written test or interview at a certain time. If you are not selected, they will also tell you not to be discouraged. You should put it down in time, relax your mind, actively find a new employer and submit your resume.
These are my suggestions for reference only. I hope my answer can help you and make you satisfied.
Finally, I wish you a happy life and find a satisfactory job as soon as possible.