Cluttered charts create cluttered decisions. For retracement work, most traders gain more from a focused set: 38.2%, 50%, and 61.8%, with 23.6% reserved for shallow pullbacks in strong trends.
Extensions belong on a separate layer. Mixing them with retracements on the same pane invites confirmation bias when price tags an arbitrary line.
Test your shortlist against three months of your own charts. Keep ratios that repeatedly align with reaction; drop the rest without ceremony.