maybe start with 3 simple steps:

1. Keep yourself active, maybe start with walking/ step counts. Try at least average of >10k to 20k steps a day consistently.
2. Calories deficit, reduce calories intake based on your current BMI consistently of course having healthier option.
3. Back to point 1, cardio, basic work out, spend more time outdoor not only for physical well being, but to improve your mental health as well.

I've doing above consistently for some time, average 20k steps a day, 4 days of gym, 30%< calories deficit almost daily and keep yourself busy.