Kaspa is also known that bags of kaspa coins of early miners are laying in tradeogre exchange and if you try to sell or send them from there message is Order failed.
Are you trying to sell using the market order or limit order? The exchange might be scamming the users. KASPA can easily be traded off other exchanges such as Bybit, Bingx, Kucoin, MEXC.
Crypto mining profitability isn't something fixed. It fluctuates due to several factors such as the network hash rate, Mining gear used to mine, coin price, maintenance, and power costs etc