Depends on each one's experience of HF be it reduced/
Mildlyreduced or preserved
Personally I have NYHA Class II HFrEF@30%.
What works for me is increasing my Cardiorespiratory fitness that include brisk walking and cycling to 12k - 15k steps each and every day take my meds and not too bothered about my diet although. I keep my weight at about 23 score on BMI scale my routine may nor suit others but presently 4 years on happy to maintain my way of doing things for my HF.