What happened with the price action last time?
There is usually a lot of BTC selling in the lead up to the halving with a corresponding price dip as miners sell on hand inventory to raise operating cash. Then the halving occurs and miners produce half the supply they were previously making, so there is less new supply available and price starts going up if demand at least stays steady.
This time might be different however because of the spot ETFs opening a channel for institutional inflows. There is a lot more buying happening now (pre-halving) than in previous cycles. There may still be a dip, but if the ETF inflows stay strong, the dip is likely not going to be as deep as previous cycles.
Also of note - I saw a tweet some days/weeks ago claiming that something like 70% of all Bitcoin is stored in "strong hand" wallets (ie. not traded/moved in over a year). Demand is growing while available, tradeable supply is shrinking.
Bitcoin is the 800lb gorilla that lifts (or sinks) all boats, but Ethereum also has a few things happening that might provide some independence from BTC trading:
March 13 - Dencun upgrade
May 23 - spot ETH ETF decision deadline for the SEC
AFAIK, Ethereum does not have a GBTC analogue in the ETF approval pool, so a May approval of the ETFs should be a much stronger lift than what BTC saw (because of GBTC selling).