The main reasons for the past pullbacks were:
1. Decline in U.S. stocks
2. Negative news, such as regulatory pressure and U.S. tariffs
3. A natural pullback after excessive rises
This time, it is not apparent that U.S. stocks will crash; Trump's tariffs have already caused one crash in the U.S. stock market. Therefore, the biggest likelihood for this pullback is simply that it has risen too much.
I don't think we should be afraid of missing out; waiting for altcoins to drop 30-40% is the real opportunity to buy the dip.
Don’t forget, the BTC pullback in January 2021 marked the beginning of a significant rally for altcoins.