The definition of an uptrend is higher highs and higher lows. Simple. Where do you measure from? This will obviously have a significant impact on your definition. The simple answer is a “trend-line”. Do not over-complicate this.
The market is still in an uptrend. Will it remain in an uptrend? That of course is always the question.
You look for commercial buying at/around the trend-line when the market becomes highly questionable due to whatever reasons are put forward at the time. This is precisely what the duCati Report looks at.
Trading the bigger/longer trends, due to the fractal nature of the market is easier due to the requirement to make far fewer decisions. Decisions contain an emotional/value component that adds to the stresses of trading the markets. Reduce the decisions required, see performance/returns rise. Day-trading increases the number of decisions/stress, and unless you are one of the few, trading results collapse.