Crypto’s volatility is akin to gambling, and gambling does sometimes pays off. On average it does not - ask the epidemic of people who lost everything in crypto how they feel about it. Regardless, past performance does not guarantee future returns - the crux of index funds is that finding “the right winners” consistently over time is impossible, and doing it for 20-60 years straight without getting burned once or twice is even harder. You may be up on crypto at the moment but if that money is part of your retirement fund you need to choose when to cash out or how to hold crypto through your entire life without getting burned.
The common advice I see relating to crypto and stock picking is to dedicate ~$1000 into those risky ventures and see how much ROI you can get. Most often, people end up trailing their index fund returns and giving up with a cheap lesson.