Bitcoin (BTC) mining has had a couple of less profitable years. After the highs of late 2017 and early 2018, profitability declined by March 2020 to as little as USD 0.0693 per day for every 1 THash of mining power (having been USD 3.139 in January 2018).
However, with the bull market of late 2020, the price of bitcoin has risen strongly, and with it mining profitability