As I see it today, price decreases are not like in 2018 where BTC prices were under $ 5k and there are still investors who save coins for the long term and don't trade, so we only see price reductions occurring at any time, there is an increase but not too high.
You can hold your coins if you believe the price will go up next year, I currently have several altcoins and don't sell them because I still believe prices will go up soon after the end of this year.