The next bullrun is said to be even more exciting, because there are so many altcoins that are still below the 2021 price,
and can be said to be undervalued, and even the price of Bitcoin which is currently at $30k is still said to be cheap,
because some institutions and traders say that Bitcoin can reach $100k even $300k in the bullish season.
I don't know where you got this information from or who says this, but there are a lot of altcoins that will never recover again. Every bear market almost all altcoins lose value by more than 90%. But in the following cycles, most of these coins do not recover to their previous values.