No, I don't think it is possible to change leverage, it is basically like a loan given to you by your broker so that it is possible to earn higher profits with less money.
Unfortunately, that is not possible. Your broker determines it, and it is not possible to change because it has a fixed value.
Your account leverage is fixed by the broker and you can not change it before every trade. If you want to change your leverage you will have to contact the broker and get it changed.
No you can’t change your leverage with every trade. That’s why it’s important to determine the leverage ratio you would want to use in your trading plan, and look for a broker accordingly.