Change job during Blue Card applicatio process

Hi all,

So I got to know that my company stop to operate by the beginning of January. It means I will be unemployed by that time. I arrived in Germany June this year and currently applying for a Blue Card. I completed the application and sent it to KVR early Septembe, and I am still waiting for my appointment.

In that case, if I apply for a new job and get one, do I have to start the new Blue Card application or continue the current one but with a new job contract? Since it may take another couple months to start the new application.

If I can just submit the new job contract without reapplying, could I start the job after ABH give me an approval or should I wait for the blue card?

Many thanks