Ask the pianist who plays the piano in cafes, western restaurants and hotels.

There is usually a ten-minute break between hours. There is no rule that you can't repeat it every day. It's ok to know dozens of songs, but if a guest orders songs, you need to know more. Pianists of pop music usually improvise, playing whatever they can sing and listen to, and the number of songs is not a problem. Jazz is generally improvisation, pure improvisation and randomness. As for classical music, you need to practice more. Nowadays, pop songs are usually played in bars, cafes and western restaurants, and there are not as many foreign guests who are mainly jazz as expected. Therefore, first practice your internal skills according to your own characteristics. If you have stage fright, you should take more exercise. Being a pianist is a good exercise in itself. In fact, if you are fully prepared, you will naturally be less nervous. Come on! Wish you success!