I don't think any crypto investment could have a stable income since the price of the coins that we hold changing everytime, sometimes it's better to hold fiat and sometimes it's much better to hold cryptos.
Experts trader know where to save fiat before the market crash and know when to re enter when the market going to bullish.
But as an investors, holding for living is a motto that we are not aim for stable profits but big profits in the future.
Interestingly, people consider USDT and BUSD and multiple other stablecoins as "crypto currency" for some reason, I do not think that they are crypto at all, they are a different breed and heavily centralized as well. The only exception for stability is those if you consider them as crypto currencies. In the long run we are talking about something like bitcoin then there is no stability at all.
I wouldn't consider myself an expert but even I know that I do not invest with every single fiat I have, I save some aside in stablecoins and use some of that money whenever price drops a lot, that way I make investment because if I go all-in then I would be losing a lot of profit whenever the price drops and I have to just wait it to go back. With some fiat saved aside, that means I could buy when it is lower and then go back to profit a lot quicker.