If the 30% refers to Left Ventricular Ejection Fraction, then the figure would imply some damage and it would not be wise to expect the same capacities as someone without
damage.
For example I am into 5+ years of diagnosed
Heart Failure with a LVEF of 10%, able to still enjoy life but not an awful lot else! But at 72 it is still good to be here!
With the right attitude, love and support those of us with heart disease can still live a happy, productive life.
Best wishes to you.