Industrial mining can only be done if electricity is cheaper than 4,5 cents, and the cheaper the electricity, the cheaper the equipment you can use. If your electricity costs 1-2 cents, then you can use used S17 ASICs and their analogues, or next year buy used S 19 ASICs, but there are few such places in the world.
Mining equipment is one time cost while electricity is a continuous cost that miners have to bear. Cheap electricity must be the first rule in your check list before you proceed to mining, my few satoshis.
If we assume that you have a location in the center of Africa with the price of electricity 2 cents, but there are no ASIC repair services there, delivery of equipment there is very expensive and risky, because there are military coups in neighboring countries, then will you be able to safely mine coins there?
