Your heart is a muscle just like your bicep.
Exercise your heart with cardio exercises and it will grow bigger and stronger just like doing weights to increase your muscle size and strength. I used to cycle 15 miles every morning and at 55 years of age I had a resting heart rate of 50 bpm.
I have a huge heart both physically and metaphorically.
I have been eating a Keto diet since before it became fashionable.
Excess carbohydrates, the modern phenomena of fast foods and obesity, leading to a slow death.
I changed to a keto diet when one of my therapy clients had terminal cancer and I wanted to learn more about cancer. I read a research paper back in the late 90's that mentioned how cancer feeds on sugars and carbohydrates which are in fact sugars. Simple really, No food for cancer no cancer. Our brains prefer to live on fat (ketosis) not sugars.
Avoid hard labour jobs.
Before I trained as a psychotherapist I worked in the building trade for 20 years. I spent half my life on my knees and humping heavy stuff around all day. Now I have painful knee problems and lower back problems.
Keep reading, learning new stuff and doing human things.
Avoid the likes of zoom and any digital screen forms of communication. We, as humans, cannot read and engage with another human being through a screen. We miss all the wonders of micro-expressions and bodily expressions in our fellow humans.