If you are not holding already crypto then I think some diversification in asset classes would be a good idea.
I agree there is no free lunch and 5%- 20% is indicative, there is inflation in crypto too so you probably going to end with less. But (of course there is a but) I think is still worth and much better then dividend stocks or equities, let’s not even mention bonds - sure maybe a good idea if you are in your 60s.
For once staking rewards are in cryptos and not fiat currency (more prone to inflation and debasement); you get paid every week or twice a week (stock and bond pay dividend every 1,3,6, or 12 months ); your staking rewards are automatically staked, so a significative compound interest is easier to achieve. Plus if the crypto currency increase in value in the long term you are going to see some serious gain.
Sure volatility in the short term can be a pain sometimes but if you able to withstand it (I think) you can make some nice return (again I am a nobody and know nothing just speaking about my personal views and experience).
In 8 months of dollar cost averaging in cryptos that allow staking (50% crypto portfolio) I made much more (with less fiat currency invested) when compared to a longer time frame -2 years- in the equities market (with much more fiat currency invested).
Anyway point of views and completely understandable if you risk appetite is not up for it