Do I need to get my orthodontic treatment redone?

It has been over two years since my eldest daughter's orthodontic treatment was completed.

Four teeth were extracted during orthodontic treatment.

I heard that recently your lower teeth have shifted a bit, possibly because you haven't received timely treatment after your orthodontic appliance fell off while attending school.

I can't tell very well, but it seems that the doctor can see a slight misalignment.

Since I am still a third-year high school student, I cannot undergo correction again and am currently using a retention device.

The doctor told me to go to university, work part-time, earn money, and do it myself.

Can I just leave these crooked teeth as they are for now?