I have had heart failure for over 12 years. Two heart by-pass surgery, I have a pacemaker and defibrillator. Recently had a hole in my heart closed. The doctor said I could not have a LVAD (left ventricular assist device) because the right side of my heart has enlarged too much and it would put too much strain on the left. Since I have given up almost all sodium, I am feeling much better. Doctor said the only thing left was a heart transplant. As everyone knows that at 79 years old that is out of the question, the other option is to follow my doctors orders and diligent take my meds.
You seem to understand your condition clearly, and to be a good patient, so I'm not sure what suggestions there could be that you won't already be aware of. Keep your weight down, be as active as possible without stressing your heart excessively, eat a balanced diet aimed at maintaining healthy blood lipids... you already know all this, yes?
But don't lose sight of the quality of your life, too. Keeping active can involve singing, and laughing, as much as striding around; and don't give up every enjoyable treat in pursuit of the model diet. You don't want to end up in that old joke about "you don't live any longer, it just feels like it."