Invest like an Olympian
Three things winning in sport has in common with a successful investment approach:
1. Exploit a natural advantage
2. Train your mind
3. Visualise a successful outcome.
What's your equivalent of Phelps' monstrous arm span and double-jointed ankles? In public markets in which most competitors are constrained by regulation or accounting, just by being a private client you are constrained by nobody other than yourself.
As long as you match your assets and your time horizons, there are no actual consequences for you of short-term volatility. You are not forced to sell when markets fall. You could even buy more. But you have to train your mind to live with volatility.
Visualise the benefits of a successful outcome. What will you be doing? How will you spend it or who will you help?