How should I adjust my diet and fitness routine if I'm switching to a more active job?

Currently I exercise 5 days a week and strength train 2-3 days a week. I am an 18 year old female, normal weight, and I eat about 1600-1800 calories to maintain my weight. Right now I have a lightly active job, but later I'll be switching to a kind of physical job requiring lifting, squatting, being on my feet. I don't want to losw weight, I want to maintain my weight but also my fitness levels.|||I tried the diet but the results were disappointing, until finally I got advice from friends, and the results were amazing, I truly felt the weight loss, and is very safe for health, you can try it