What should be the best expense ratio?

As an investor in the world of cryptocurrency and finance, I'm always looking for ways to optimize my portfolio and maximize returns. One of the key factors I consider when evaluating investment opportunities is the expense ratio. But what exactly should be the best expense ratio? Is there a specific number or percentage that I should aim for? And how does the expense ratio impact my overall investment performance? I'm curious to know your thoughts on this topic, and how you recommend investors like myself navigate the complexities of expense ratios in the world of cryptocurrency and finance.