A guy once told me, altcoins generally do what bitcoin does, but to a larger extent.

So BTC goes up 10% --> Alts go up 20%
BTC goes down 10% --> Alts go down 20%

While there are some exceptions (ETH did not crash now, presumably because of the ETF rumour), during the last month I verified this.

I want to sell my BTC when I expect the next bull run to be over. But I do not want to cash out because that will lead to confiscation of the profits via taxation.
Someone told me to swap the profits for stablecoins. But stablecoins are currently under serious attack, and are at risk of getting depegged.

Is there any alternative to cashing out and paying enormous taxes? It makes no sense to swap 100k worth of BTC to an altcoin when we expect a BTC crash of 40%, when all other altcoins are likely to crash even harder.

I wish there was something that behaved conversely to the BTC price.