One of the best ways to raise HDL is through exercise. Brisk walking for 30 minutes most days of the week will have a great impact on HDL and raising your HDL will balance out your total cholesterol number as Total Cholesterol is a ratio between HDL and LDL. LDL can be lowered for many through diet. Exercise is a key component for HDL so make sure to get that regularly. good luck
This article explains it pretty well: https://www.medicinenet.com/hdl_vs_ldl_cholesterol_differences/article.htm#what_do_the_hdl_and_ldl_numbers_mean
Eating a healthy diet is key to boosting HDL (good cholesterol) and lowering LDL (bad cholesterol). The article has some good suggestions for foods to eat to help keep the balance right.