How Can I Maintain My Weight Without Exercising as Much?

Hi! I’m starting college in a couple of days, and I was wondering if y'all have any tips on maintaining my weight.

For the past three months, I’ve been consistently doing cardio and eating in a calorie deficit. As a result, I’ve gone from 58 kg to 50 kg. However, I’m about to start nursing school, which I know will be pretty demanding, so I may not have as much time to exercise as I used to.

I’m worried about gaining back the weight I’ve lost, especially since I might not be able to do any kind of exercises due to a busy schedule. I’d really appreciate any advice on how to maintain my current weight. Thanks!