If you stand up and sing a song, you are finished.
As for what song to sing, it depends. Don't sing so sadly. The two songs you mentioned are from Jane Zhang and Yang Kun. You can also sing them, as long as you can make the audience feel your strength, but it is not recommended. It is best to sing what the public knows, which is better for the scene.
Newcomers should lower their social status and walk more. You will know that it is actually very difficult to do a good job, mainly because it is really difficult for guests to cooperate with you to adjust the atmosphere.
Of course, you are a professional singer. Forget it.