Rational Optimism
It is difficult, if not impossible to make a good investor out of a natural pessimist.
Investment success is based on an continual long term optimism.
Not a one-eyed optimism that says everything will be perfect along the way - it will not, there will be challenges - but a rationality that whatever the problem-du-jour: inflation, war, unemployment.... that marks the front of our news pages today, shall be overcome at some point in the future.
It has done in the past and shall be in the future.
Human progress and problem solving is inevitable but we cannot time or control it. Instead, seek advice around the areas you can control, to negate your own blindspots, from those who are rationally optimistic.