Suggested for 15m and above, 1h & 4h makes most sense.
It may seem like the Minecraft / Roblox version of the Bollinger Bands, but it isn’t.
The idea is to have a directional bias based on which side the price is on: above the line is bullish, below not so.
It is fractal based, it has an RSI filter (it picks between a slightly displaced support and resistance line resulting in one continuous line) and the “bands” are 3 of the previous 21 sample ATR’s distance away. This to see a break away move and/or spotting the price at a stretch.