There is also a 4th factor which is Triglycerides. This calculator and the various references it contains will probably tell you most of what you need to know. http://www.hughcalc.org/chol-si.php
As I'm a registered HCP I cannot give you advice; but I could suggest that you visit a website that you may find interesting, particularly one of the books mentioned. The website is a blog written by a practising GP and health sceptic https://drmalcolmkendrick.org/. He discusses cardiovascular disease and diabetes.