SELF research to the best of your knowledge and belief, thinking, thinking, thinking, trying, failing, eventually not failing, practicing, learning, developing. The emphasis is on SELF. That's the tip I can give you.
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@Rizzman First of all, thank you for your answer. However, this is a general credo for every situation in life (which is good and true in itself), which can also help, but the sense of the question itself and the opportunity given here on GetQuin for feedback for an existing portfolio, somewhat ad absurdum 😉

As I said, thanks for your time and the answer.