Whatever system you choose, if you don't have discipline and patience, it won't work.
I trade 2-3 setups depending on the day. Nearly always the m1 time-frame and mostly London Open first 90 mins.
What I rely on is a suite of indicators to give me all the information I need to make a decision then I wait to see if a setup comes my way. The most common setups I look for are an AC Correction, Supply / demand flip, 1-2 and trendline break.
These are the eWh indi and ABC123 (Snorm) indi's and also levels - all the opens and closes - Day, Week, Month, The Overnight Open / Close, Supply Demands on m1 and m15, Fair Value Gaps, Fib levels and Trend Lines.
Working with a strong HTF magnet as a target and the above tools I can enter a trades on price response at these levels and aim for a strong target.
I also use the Advanced Trade Manager to manage the trade. This has some nice automation when I cannot be with the trade until the end.
Example trade and tools / indi's screen shots
Attached Image (click to enlarge)
On both the images you can see examples a few trades, each with a price level being broken, level tested and a price reaction at the test. Most trades also have a target level that I am aiming for.
Attached Image (click to enlarge)