Small scale mining is very very very very very hard to profit.
The best btc miner is the s21xp 270th at 3.5 kwatts
So 270×0.043= 11.61 usd earnings
3.5x24= 84 kwatts burned in a day or $8.40?at 10 cent power cost
That is about $3.21 daily profit or 2400 days to break even with 10 cents power.
With 5 cent power it costs $4.20 so
11.61-4.2= 7.21 or just about 1000 days to break even.
But usa you can write off the 7200 that the machine cost. That saves about 2400 in tax.
So 7200-2400= 4800 cost so you pay off in about 1500 days at 10 cent power and in about 650 days with 5 cent power.
That is with current price of 84k
If you have money for power and hold the coins and coins go up you get out faster.