can you take it apart clean the filter pads, check that there is nothing jamming the impeller.
after doing this and it does not work, give it a light tap, just to make sure its truelly broken.
It's an aqua one filter by the way, i can feel the tiniest bit of flow coming out, but not as stron as normal. Even my bristlenose are coming up to the surface.
do you have an pumps or other filters that could create water movement, because this seems to be your main problem, your fish need the exchange of gases and this is not happening quick enough,