For lack of concentration, you don’t have to be too demanding on yourself. You can adopt a "let nature take its course" attitude to calm down your mind. If you want to be more focused, you need to make your mind more focused. Tranquility does not mean that there are no distracting thoughts at all, but it means that the psychological conflicts between dilemmas are reduced as much as possible. Zhuge Liang said: "Nothing can go far without tranquility." I would like to send this sentence to you, hoping it can be helpful to you.