so the first step is to determine capital gains or losses for each position in your portfolio by subtracting the current price from the cost. take into account all your crypto holdings - not only those that are in the same wallet or on the same exchange. use the FIFO method. it minimizes the risk of short-term capital gains. In particular, you first sell the oldest positions, which means that you are more likely to receive long-term capital gains. maybe speak with your accountant to learn more about it. and last step is selling the position at a loss, and optionally, repurchasing the position to maintain the portfolio’s asset allocation.