Insurance between quitting to change, policyholder changes, is that possible ?

Meal. I have a somewhat more complicated question, you can probably also see on the title I have allowed a golf on me for over 2 years, as insurance we took at that time on the second car insurance of my mother where I started with 75%. Now I am meanwhile SF2 and next year SF3 where I will definitely change the insurance because my DEVK is “priced” in contrast to others. Now I would like to know, I have a chance to get out there now also we nn the contract runs until the end of the year ? I know this is possible if a damage has occurred, or you sell the car etc. Since I am the owner, my mother the policyholder, I would like to cancel the insurance and look for another, which I then close, is this possible or can this only be done if the holder changes. And to the damage case, I had last year in August a “total damage”, it probably does not work retroactively or ? Thank you !