altcoin season will occur if the price of Bitcoin increases very high and reaches its ATH price, then that's when the price of altcoin will definitely increase very high, so my advice is if you want to cover your altcoin to Bitcoin, then you have to sell your altcoin during altcoin season and hold on USDT, then when a bear market occurs (correction) and it's the right time for you to swap your USDT to Bitcoin.
The impact of Bitcoin prices is very influential for altcoins because without the support of increasing bitcoin prices, altcoins will never reach high increases except just because hype and altcoin news are only temporary trends among trading community groups, so your advice is very good to cover altcoins to bitcoin to buy bitcoins at low price.