Most common is bad capacitor that provide second phase to rotate the motor. Looks like our fan is using remote control and the PCB is inside fan cover at the center there.

Is this a DC fan or AC fan?

same model, speed 1 really no wind. i never use speed 1. if can better change other model

PCB about 40 bucks only on shopee. Check the model sticker on the fan and buy a PCB that fits. This model easy to change the PCB plug n play. Unless you already have soldering equipment and flux, solder, etc then only bother to replace the caps but technically easier just save the time and replace whole board as the run cap also on its way out (similar lifespan) if speed control cap already kaput.