You will be able to find many charts that have this signal perfectly finding the top or bottom of a significant trend.
It successfully indicates profitable reversal around 80% of the time. So far, It is 85% accurate or better in determining downtrend start points on the Daily, 120, 60, 30 Minute charts according to the study of more than 10,000 occurrences. It is 86% accurate on the 30 Minute chart.
This is another tool I use in finding or confirming potential price action. Hope you find it useful.
To add this, favorite the script by clicking "Add to your Favorite Indicators" at the top of the code portion below. On your top tool bar is an "fx" button with a downward arrow to the right of it. Click on the downward arrow/caret and scroll down to "RSI-Last-3-Extrema". Click on this title and it should add to the bottom of your current chart. If you do not see BUY (green vertical bars) or SELL (red vertical bars) right away, try other charts and timeframes.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.