will a 1800 calorie diet work for me?

I weigh 297. I started out at 316 a few months ago. My dietitian said I should be eating 1800 calories. I am trying to lose weight and was eating 1200 calories and losing. I feel very deprived eating this amount though. I am worried I won’t lose on the 1800 a day. Does anyone have any experience in this?
and please no scam suggestions such as acai berry.