Buy Bitcoin and then continue with DCA ( Dollar-cost averaging bitcoin) and after a period of time you will have a good amount of satoshis in your wallet. There price of those satoshis will grow organically and you will earn a good passive income. Don't rely on anything else in the crypto market other than Bitcoin.
DCA to accumulate more satoshis, bitcoins for our portfolio is good. With DCA, we have better control on our capital and psychology against volatile market. We will be less affected by fud, news and market manipulations.
The DCA strategy is helpful for investors in accumulation through a long time and the chart of Satoshi per dollar or renamed it as Satoshi purchasing power chart, shows that our portfolio value can increase considerably with DCA too.
https://charts.bitbo.io/satoshi-per-dollar/There are plenty of ways to make passive income, but are they worth it? Locking your funds in a smart contract, or an exchange for some period of time to get some returns might sound lucrative but there is always a risk associated with it. Even if the project or exchange involved is not a scam, there is always that risk of a "hack". This is all assuming that you have enough capital to generate some good returns to start with.
If people want to get passive income by converting bitcoins to Wrapped Bitcoin tokens, that are not bitcoins, they are doing bad practice. It is risky that they migrate from actual bitcoins to wrapped-non-bitcoin tokens, just to hope that they will get good passive income from promised high APYs.
In the end, they might lose those tokens if that DeFi platform is scam, or these tokens can lose its value and their portfolio value will become zero or lose significant value. The drop of CRV token recent days is a warning for them.
If they have bitcoins, hold their bitcoins to get passive income with bitcoin only. They don't have to do any extra thing, just holding.
If you really want to get passive income with crypto, I would focus on building something that could generate that for you instead of going with the above. An useful app, a blog or news article, etc.