What I would do is first manually test extrusion/retraction, then open it up and watch the extruder gears to see when/how it fails. If you’ve opened up the extruder and everything works without issue while open, it may be something pinching the filament that shouldn’t be once it’s put back together.
Check out this, particularly starting at the “Hotend Clogged” section, as that and directly below that seem to be most relevant to what you’re experiencing:
Also, make sure your nozzle buckle is on securely, typically I wouldn’t expect that to be the cause of this, but while you’re in there it takes 2 seconds to press on it to check so 