Any advice would greatly be appreciated. Well, this is an ongoing issue that is of heightened concern lately. The first is to understand the risk from the numbers you list. Cholesterol elevation in the body is linked to foods either which are high in cholesterol or in saturated fats. Cholesterol is ONLY found in food from animal sources.
Saturated fats are any fats that is solid at room temperature, which includes things like margarine.
So the strictest way to minimize the contribution of diet on your cholesterol level is to minimize fat intake overall, but especially fats of animal origin or those that are saturated. But it may be that changing your diet does not do much for your cholesterol problem if it was lower before antivirals, and the elevation is due to the medication effect. We have had at least some who responded just to exercise as you mention - with reductions in cholesterol and triglyceride levels. So you should see if what you are doing is helping. Some who have elevations have success with these, though again some do not respond.