Literally, there are many benefits to be gained from investing in Bitcoin, you can also escape the clutches of inflation. An optimistic response will provide peace of mind in investing, just look at how many investors are starting to make Bitcoin their main investment, it proves that Bitcoin is not only for 30 days, but has no time limit.
I believe only two coins can be called a "safe haven". Those are Bitcoin and Litecoin. The rest are more akin to digital cash. BTC and LTC are both scarce, reliable, and truly-decentralized. The former often rises in value, while the latter is much more stable. However, that doesn't mean Litecoin doesn't experience gains when the market turns bullish.
In the analog world, Gold is like Bitcoin, while Silver is like Litecoin. I didn't mention Ethereum because the coin was built with inflation in mind. It's said the supply of ETH is unlimited. I'd say Ethereum is more akin to Oil. You can use it for real world applications (Web 3.0), but don't expect to get rich holding it long-term. It doesn't bring as much gains as Bitcoin does. Even now when the market is bullish, ETH is worth around $3.1k, while BTC reached $90k. ETH should've been worth at least $5k by now. But that's another story.
By the way, you can hold BTC way beyond 30 days. Only if you have the "guts" to do it. I'm hoping BTC overcomes Gold and becomes the best store of value in the world. Maybe someday, right?