What I should have done while still at boarding school:
become more aware of other people;
become less introverted, insensitive, inconsiderate, selfish etc;
thought about society and politics;
seen through religious indoctrination more quickly;
However, "should" implies "can," whereas, at that time, I was completely incapable of doing most of these things. "Should" can only mean "It would have been better if..." A completely different upbringing and education would have helped.
If we knew that some adults meditated without any supernaturalist belief, then we would have had the opportunity to inquire further. Years of merely reading about religions in general and Buddhism in particular could have been bypassed.