Making a living or making a life from trading comes down to backtesting.
Backtesting has a significant place as part of a retail traders arsenal. However, as the adage goes: Past performance is not indicative of future results.
It is very important to retain your sharpness with this ever changing market. This sharpness (or edge as some choose to call it) can only be retained and evolved with forward testing. This in turn allows you to tweak/alter your algo for backtesting. Without this, you are backtesting nothing.