There are several reasons for under-extrusion:
- wet filament,
- printing speed too fast,
- nozzle clogged,
- temperature too low,
- flow rate too low,
- …
You will have to test each of those settings one after the other until you find the good one.
Start by drying the filament.
Then, if that has not changed, clean the nozzle, reduce the speed and finally increase the flow a little in steps of 5%.
I think the temperature is good.