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In conclusion
Loses occurs everyday, although is painful but don't let it weigh you down, Quickly learn from previous mistakes and apply self discipline.
If you're referring to investment, I think your assumptions and advice are inaccurate. As I understand it, your assumptions are clearly more suitable for those who enjoy trading, not investing. There are no daily losses if someone invests long-term. Bitcoin investors, essentially, hold their Bitcoins for a long time. So, if you're referring to daily losses, yes, that clearly points to trading activity. If you're referring to Bitcoin traders, your advice is quite sound. Emotions are the main enemy when trading.
So, being able to control your emotions when trading is clearly a crucial asset. Furthermore, trading is inherently risky, especially if you're trading outside of the spot market, which is even more so. Therefore, you should be careful if you're a trader. Because basically, even though Bitcoin is the asset you trade, it still carries a big risk.