you can mine eth or etc and convert to btc. I do it all the time.
With ETH going PoS... I guess that there won't be ETH mining after September (am I wrong?). But I would not rule out a great recovery of ETC.
However, finding what (other than ETC) coins can be mined after September may be interesting.
eth is mineable till Jan or feb. 2023
but diff goes way up in sept. 2022
It should be very interesting time say 23 days or so.