What is the secret to good bubbles?

Could you please elaborate on the secret to creating robust and successful bubbles in the world of finance and cryptocurrencies? I'm particularly interested in understanding the key components that contribute to their formation and sustainability. Is it solely based on market sentiment or are there deeper fundamental factors involved? Furthermore, how can we ensure that these bubbles, while potentially lucrative, do not burst and cause widespread economic havoc? I'm keen to gain insights into the strategies and practices that have led to successful bubbles in the past, as well as any potential warning signs that may indicate their imminent collapse. Thank you for your expertise in this area.