<p>I have been printing toy cars for about a month now and my Ender 3 has stopped extruding plastic even when I insert filament, it has been about a day since it stopped working. Is there any tips for getting it working again?</p>
<p>I tried manual feeding which worked.</p>

You need to figure out what is not working
Is the hotend getting hot?   If not, melted filament won't come out.
Is the nozzle clogged?   In your toolkit was a bit of thin wire for poking into the nozzle - try that and see what happens.
You may need to heat the hotend, extract the filament, wait for it to cool, remove the bowden tube and push the wire up from below, if the obstruction is too big to come through the 0.4mm nozzle.
Is the extruder pushing/feeding filament?  Undo the bowden tube at the top, tell the control panel to extrude and observe if plastic moves.  An Ender3 V2 has the round handle on top, you should see it slowly revolving.
If you can see the gears turning and the filament is not coming through, try snipping that piece off and inserting a fresh end.  Also clean inside the pushing gears of the extruder, could be simple plastic detris laying about.
Are you having reel problems?  Can you tug on the filament and have the reel turn? If not, it might be binding on the roll, or knotted/tangled.