Letter writing? Where are you supposed to get the stamps, if you are to stay in all the time? And where are you supposed to get money for stamps if you are no longer employed? I agree that watching the lamestream news is going to give you a bad perspective on what is going on (first they tell us that it is nothing, then they tell us that 10% of even young, healthy people that get it will die and half of those who survive will be permanently harmed, then who knows what).
But, there is a big problem with absolutely no contact. Yes, keeping exposure to a minimum makes sense especially if you are vulnerable. But, you could succeed in getting it to zero only to get one big exposure where you least expect it. The outcome then will be worse than if you had incidental exposures combined with good supplementation. Plus, your immune system will become weaker with no exposure to anything. Then, next time you get a regular cold, it will be a whopper. A cold could then put you in the hospital instead of giving you a couple of days' misery. The flu could kill instead of putting you out of work for a few days. All because your immune system got weaker.
Or worse, you could get autoimmune problems from zero exposure to anything. This could lead to allergies, asthma, arthritis, and more serious problems. I am expecting more people to get conditions like these during the coming months, and the ones getting them will be those with zero contact to germs combined with little or no supplementation. Which is what the washtowel, belatedly suggests about a month behind the lamestream and 3 months behind sources that suggested this would become a major problem. That is when I began stocking up and getting more supplements--to avoid most of the panic buying and shortages. Obviously, if you are vulnerable, you will need to take more precautions against exposure than those who are less vulnerable.
Masks? That is the law in most places these days. In some places, just going two steps out the front door requires a mask.