Hi - I have high HDL (averages around 135) it’s not genetic as it wasn’t always that way, but it rose steadily when I adopted a very low carb diet to control diabetes (now in remission). The rise was a bonus. I just found this from a couple of websites:
From Medical News Today:
HDL cholesterol: 9 ways to increase it
How to increase HDL:
Consume olive oil
Follow a low carb or ketogenic diet
Add coconut oil to diet
Eat fatty fish often
Avoid artificial trans fats
Plus the usual exercise regularly, quit smoking, lose weight
Fom Verywell Health:
How You Can Raise Your HDL Levels
What About a Low-Fat Diet?
Substantial evidence now shows that a low-fat diet often reduces — rather than increases — HDL levels. This result is not specifically caused by “not enough fat,” but rather, is caused by consuming too many carbohydrates. The American Heart Association and the American College of Cardiology have quietly stopped recommending low-fat diets for heart disease prevention. Indeed, it is low-carb diets — and not low-fat diets — which are associated with higher HDL levels.