On some recruitment platforms, I submitted my resume, but there has been no news. I don't know if it's appropriate or the other company hasn't checked it. ! ! !

The two reasons you mentioned will come up, either because you think your information is not suitable, or because people don't have time, so your best way is to call directly when you see someone who suits you, ask them if they are hiring, and then arrange an interview. This is better. I used to do this.