Mining is still profitable in 2021, but the profitability will be lower than it is now. The main reason for this is that the price of cryptocurrencies has decreased a lot recently, which has caused the value of the coins that miners extract from the ground to decrease as well. However, there are other factors at play as well. For example, some mining companies have started using more efficient equipment, which means that they are able to extract more coins from the ground with less energy expenditure.