Except for a few people, I am afraid there is really no answer to your question. ——So, you are lucky.

Improving your problem is not just about vocal cord closure, it also depends on your training methods and daily breathing habits.

1. It is necessary to practice bubble sounds. This is definitely unavoidable. If you want to take a shortcut, I advise you not to think about it. However, as long as you can still speak normally, you can make this sound. The key point is, try to practice when you first get up, you can lean back, or you can practice directly lying down, which will be better for you to make this sound. Furthermore, you can try to open your mouth wide and open the temporomandibular joint, and then start from the high pitch and gradually decrease. Find the feeling of the bubble sound and try to consolidate it. If you can consolidate it a few times, you can try pronouncing it with different vowels.

2. Air leakage due to pressure in the throat can also be solved.

First, from now on, break away from popular music and try to sing only bel canto, and the easier it is to sing, the better. Then, remember this state, and try to exhale and sound in this way when you speak on weekdays. It will feel strange at first, and others may even think you are sick, just like what happened to the now-famous CCTV announcer when he worked hard to practice his broadcasting voice in the early years. But, be yourself.

Secondly, Qi will be lacking if it is not practiced. Therefore, necessary aerobic exercise is required. This is something fundamental. If you only practice skills without cultivating the fundamentals, if you have watched martial arts, you can imagine, even if you practice moves every day, can you reach the level of Dugu Nine Swords? Even if you are lucky enough to achieve it, you are not in a world of moves and skills, but a world where many singers have "internal strength". If you don't cultivate your internal strength, you won't get far. To give a simple example, if you ask a person who is breathing in a lot in a hospital bed to sing, no matter how skilled he is, will he be able to sing? Got it.

Thirdly, apart from the famous ones, today’s vocal teachers are just like that. If you lay a solid foundation by yourself, if you have a good foundation, you can enjoy the icing on the cake; if your own foundation is not good, it is impossible to expect the teacher to give you timely help to change the status quo.

3. The wrong way to practice explosive power is just self-indulgence and drinking poison to quench thirst. When it comes to explosive power, there is a man named Chen Leji. If you know him, you will probably understand what it means to have strong explosive power. But their training methods are definitely not like yours, so they don’t have the same problems as you. And if your current social status, family background, network resources, and economic capital cannot allow you to keep up with people who are truly in the mainstream, then stop practicing in the wrong way and start from the basics. ——Making up the foundation will not be boring or difficult. Judging from what you have expressed, you already have a certain level. What you want to make up for should be the missing foundation.

4. When you reach the low range, you become weak or have a glide tone. In short, you can’t sing well. Obviously you don’t know how to use your breath at a high level, and you lack sufficient understanding and proficiency in long-term vocal production and long-term singing. Adaptation and sufficient number of successful experiences.

So, no matter how hard you try to chase high notes or process certain special sounds, there will only be one result: when you actually go on stage to sing, most of the time, you will still lose track, even if it takes a long time. You will inevitably lack confidence in yourself. I even got distracted while singing because of this - because I was afraid of something going wrong, so something did go wrong (I still couldn't sing well when it got difficult).

Because: being able to sing well occasionally ≠ you can do it every time without any problem.

5. What another friend said about "Heidegger's vocalization" is basically the same thing as what I said before. Same things, different names, lots and lots of them. You can also refer to some of the singing techniques and practice experiences left by that great Italian artist, Caruso.

6. If you are willing to work hard. After that, it comes to what you eat, drink, and how to cooperate with maintenance and treatment from a medical perspective. The source is yourself, and everything else is auxiliary and secondary. The human body has its own healing ability. As long as you don't harm it, as long as you are not disabled, and as long as you have not completely lost your voice, under normal circumstances, you can take care of your vocal cords on your own. Don't eat excess food blindly, otherwise it will cause trouble if you eat it badly. Unless you really understand the health knowledge of vocal cords, instead of just reading some content on the Internet or copying the contents of some popular books that are difficult to distinguish the authenticity and effectiveness.

Go practice.