If the Total/HDL ratio is to be believed, you're at slightly less risk than average due to low trigs and low LDL offsetting your low HDL. But how's your diet? I'd suggest mostly whole foods with very little sugary foods or white bread.
And I'm an advocate of walking too. I found this on the internet: Going for a brisk walk for half an hour, five days per week, can boost your HDL by roughly 5 percent in approximately two months, MayoClinic.com explains. 5% will raise your HDL from 30 to a whopping 33, but I've found the increase for me to be bigger than this but YMMV.
I may have suggested this in the past but I'm a fan of eating sunflower seeds (still in the shell) as a snack. It takes about 30 minutes of "snacking" before you consume ~150 calories. An internet search revealed: One of the major health benefits of sunflower seeds may be in protecting your cardiovascular health. They contain a number of important compounds that can help protect your heart from damage and prevent heart disease. They can also help lower risk factors for cardiovascular disease, including cholesterol and triglycerides.
I also like apples and I typically eat a 2-3 every day, and here's a find from another internet search: In human studies, consuming up to two to three medium-sized apples resulted in a decrease in total cholesterol levels between 5% and 13%. LDL cholesterol levels were lowered by at least 7% in some studies, and HDL levels were increased by up to 12%. Studies found that the ingredients in apples most likely contributing to the improved cholesterol levels were pectin and polyphenols.