What is a change of character (CHoCH)?
In a downtrend price makes lower highs and lower lows, and each new low is a break of structure down. The change of character is the moment that pattern breaks: a candle closes above the most recent lower high. Sellers who were in control have failed to defend it.
One CHoCH is not a new uptrend yet. Many traders wait for the pullback after it to hold as a higher low, then look for entries there, often after a liquidity sweep at the final low. ICT’s close equivalent is the market structure shift.