To reduce high cholesterol levels it is important to maintain a lifestyle that includes a healthy diet low in cholesterol, saturated and trans fats. Diets containing polyunsaturated fats, monosaturated fats, and fiber can lower cholesterol levels. Apart from eating a healthy diet, lifestyle choices such as exercising regularly and maintaining a healthy weight can also help to lower cholesterol levels. In addition to these measures, some people are advised by their physician to go on medication to help manage their levels. It is important to regularly check your cholesterol levels to ensure that they remain in a healthy range.
Reference:
Johns Hopkins: https://www.hopkinsmedicine.org/health/conditions-and-diseases/high-cholesterol/high-cholesterol-prevention-treatment-and-research
NHLBI: https://www.nhlbi.nih.gov/files/docs/public/heart/chol_tlc.pdf