Technical analysis boils down to two concepts:
Narrative & Price Levels.
Once you know the narrative, the relevant levels will illuminate themselves. If no narrative can be found, do not trade.
Textbook retest of a lost swing low.
Why are these levels retested?
1. Retail has been coaxed into shorting as it looked attractive to do so. The move back hits their stops and floods the market with liquidity
2. The area lead to a break of structure, MM's telegraph down move