Passive income through Proof-of-Stake is great and makes holding the coin much more interesting. I am staking Spectrecoin where users can choose between normal staking (XSPEC) and anonymous staking (SPECTRE). The reward is much higher if you stake SPECTRE and it is quite profitable.
Spectrecoin is good, and one of the most undervalued cryptocurrencies in my opinion. With privacy features, PoS, and several other goodies, it's a cryptocurrency with high potential in the future. Still though, many people are looking for ways to obtain bigger profit with crypto, which means that low-reward PoS coins will be out from their considerations.
For building a reliable passive income with crypto, masternode cryptocurrencies seem to be the ideal solution nowadays. They're the most rewarding coins on the market, but they require a large investment into them. The top choice would be Dash for masternodes, but PIVX and Zerocoin are also good.
It's recommended to never invest all of your life savings into masternodes, as they provide a higher risk that other cryptocurrencies which are based on PoS. Which is why, it's best to diversify between masternode and PoS cryptocurrencies in order to maintain a passive income that will generate you substantial profits in terms of USD.
Of course, you need to keep an eye on prices since crypto is highly volatile. You can prevent huge losses if you quickly cash out your crypto as soon as you obtain the rewards. Otherwise, hodling your masternode or PoS earnings for the long term might yield negative results.
Nonetheless, it's still widely possible to build your own passive income with crypto nowadays even with a bear market. You just need a lot of time in order to analyze the crypto market to maintain your income. But, this could never replace your real job as the earnings are quite small (depending on the amount of money invested). Just my thoughts