I am interested in a sustainable process, not a one shot fake gem.
But you are asking for an unsustainable thing anyway.
The altcoin staking system is not sustainable. Ask why? Because once a group starts staking a coin, there will be a constant rage to accumulate more and more by that group. The good thing is that the prices will go up but the bad thing is that the chances of getting an ROI with the same investment capital becomes low. The ones getting in late will have no chance of making any sort of return and very soon this ends up being a manhood-war between the bagholders. Silently other bagholders sell off their holding at this inflated price and then exit the same leading to the end of that altcoin.
Same will happen with all the DeFi lending pools.
Only the ones who remain profited at the ones who were diligent to get in early and buy a huge stash and then exit before the peak happens. It becomes a rat race for joining the next big shitcoin.
You might have a different opinion, but I have seen the ICO market, the defi market and the concurrent "passive earning" traps set up during each of such hypes. All them are rat races. But if you can "sustain" them then good luck to you.
To answer your question though :
https://coinmarketcap.com/yield-farming/