A leaner cut like tenderloin is fine.
Ultimately you just want to keep the calories you get from saturated fats from animal sources to less than 10% of your daily calories. You can still enjoy a nice steak or burger every once in a while, but they shouldn't be a daily staple if health is a priority.
Try eating the usual health-promoting diet high in fiber and low in saturated fats from animal sources, mostly whole foods, lots of fruits and veggies and legumes and whole grains, lean meats, etc.
After a few months, check your blood work.
Then reintroduce fattier cuts of meat into your diet and see what your numbers do after a few months.
Processed meats are so bad, they should be eliminated entirely from everyone's diet. The World Health Organization has classified processed meat as a Group 1 carcinogen. No amount of it is considered safe.
Unprocessed read meat is still a problem and WHO advises less than 350g a week. Which is 12–18 ounces of cooked meat. 12g is about one adult serving of steak. So you really are looking at 1.5 servings per week of unprocessed red meat to be safe. At most! You probably should try for less or closer to 12g.
And really if you're at a healthy weight, then I'm not sure how helpful this is. Obesity is a bigger risk factor. This is a bit of the elephant in the room for heart health. Not only should we not be eating things associated with heart disease but also we need to keep ourselves at a healthy weight.
yes obesity is bad, as the source enemy of most diseases that kill and are not cancer is inflammation. find a diet that makes you not obese and have low inflammation, that is vastly superior to "Mediterranean diet" or "plant diet" for everyone.