May of us and including me does not know the difference between the normal increment of price and the bull run increment of price. I think that the bull run price increment differs from other price changes because the bull run positive price is always building to a new ATH. If this is true, what happened last week is nothing close to the bull run, rather it is a normal price increment that we see when bitcoin has consolidated for so long.
I think we are going to experience another bear market to the region of 20k before bull run will come.
The bull run is just a trading lingo, not some strict, technical term with clear rules. In traditional stock trading, it's generally accepted to use that term after a >20% increase in price. Of course, for Bitcoin expectations are set a little bit higher than that.
I'd say we can talk about bull run when we have a longer period of consistent growth (with occasional drops of course). In simple terms when there's more demand than supply.