Summarizing the current leaders in various altcoin sectors
If you're unsure about buying during a dip, just buy the leader

ETH Ecosystem: ENS
New Public Chain: SUI
Decentralized Spot Exchange: UNI
Decentralized Contract Exchange: HYPE
RWA Sector: ONDO
Chain Games: PIXEL
NFT: PENGU
DEFI Lending: AAVE
MEME: BONK
BSC System: LISAT
Stablecoin: ENA
L2: ARB
Platform Token: BNB
AI: TAO
POW: BCH
Ethereum Staking: LDO
Cross-Chain DEX: COW
Oracle: LINK

When buying altcoins, I have always had one principle

Leader mentality.

Don't use the rebound theory. Leaders can keep rising, and they can get stronger, with a significant bloodsucking effect. The garbage coins that rebound come later.

Another method is to observe which altcoins are the most resilient during each dip.

If you don't know what to buy, just buy the leader during its pullback.