This very problem creates a systemic failure risk for cryptos. All of these altcoins are good at showing this potential when the market crashes. If difficulty jumps up or market value dies, then the network can die from a profitability point of view as miners back off and block rates plummet. The recovery point is a kind of hard reset where the P2P nature drives a consensus on difficulty correction. Once the margin is low, only high-volume, low margin providers can compete in power efficient hashing. Basically, if a chip producer thinks there is any ROI in mining, why sell any chips at all?
Anyway on the profitability side, you should consider energy consumption with respect to heating since winter is rolling in. The thermal efficiency of a heat pump is proportional to the outdoor air temp, and can be 3x efficiency down to 1.1x, or if you don't have a heat pump or gas, then the mining waste heat directly offsets my heating costs. The power is not free but it appears that way on the books, so I'm basically leasing 500W of GPU power at-cost, which can be $30/m.