Making your "trading" decisions easy without predicting future prices.
Always dump fiat for bitcoin. You can call it dollar cost averaging, but this is simpler - if you don't need the fiat now (to pay rent), dump it.
Never sell bitcoin. If you need cash, use it as a collateral for a fiat loan. Shorting fiat (that loses value) and not deciding when you can spend (Bitcoin price does not matter that much).
You keep your btc value and if the rate of rising prices is higher than the interest rate (it mostly is), you can repay the loan later with less work. Or you can just keep the credit line open indefinitely. Also, when you don't sell btc, you don't pay taxes from the sale of btc.
So: always buy, never sell, spend whenever you need to.