i don't think that it is plausible for me to create a living with bitcoin. Only high ranking members of this forum can get enough money to sustain themselves. i don't post that often to. So no, i don't earn a living with BTC.
any way if i did i would buy for low price at sell for high. I would also trade. this would probably the strategies that i would use to maximise my earnings.
Not even all of the highest-level members can earn even close to enough Bitcoin to sustain themselves, even if most of them had a low living cost in whatever country they're from.
You also seem to have the basic principals of trade down pat, so maybe you can look towards that as an idea for something you can do in the future.