For gpus do not even bother to mine BTC. But you can do clever something like mine other actions what is the most profitable that day and tha  exchange it to BTC.  Other option is mine with ASIC miner . If you have elctricity bellow 5 cents per kw mine at home if not mine ad hosting location for example here https://oneminers.com/pages/ethiopia-hosting-center. 5.4 cents per KW. I was at bitcoin conference in Addis Ababa in Ethiopia and it looks really solid, well managed and politically safe . There were even security top officials and from their central bank. I even visited the site.  Regarding miner choose anything what is the most profittable that day  s21 , T21 and so.