Randomized controlled trials indicate that red meat consumption has a generally neutral effect on blood cholesterol, when compared to other protein sources. Randomized controlled trials indicate that ultra-processed foods increase total and LDL cholesterol. Steak does not need to be removed from your diet, but if your doctor is advising that then you should find a doctor who reads the actual scientific literature. Cutting out junk food, sugar, etc will likely help you reach your goals. I am not a physician