Newbie issues with Creality Ender 3 V3 KE - layer separation/delamination

Hello!
I am a first time 3D printer owner and complete newbie when it comes to everything to do with it.
Bought this printer and managed to print a pretty good first Benchy after set up as well as a cute 3D mini dog. It has all gone down hill since. I would say I have attempted to print about 20 other items (mostly small mini figures) - so not that much at all.

I am experiencing huge issues with layer separation/delamination. I have tried multiple things and reprinted a Benchy with each adjustment and seen no improvement. This is what I have tried so far:

  • Changed nozzle from 0.2mm back to 0.4mm
  • Tightened belt screws and checked all other screws aren’t loose
  • Ensured nozzle temperature is around 215% during print
  • Turn off fan for first few layers of printing
  • Adjusting printing speed (75%)

Each time I have printed I have selected the collaborate option

Please help me! I have watched so many you tube tutorials but there is such a wide range of advice, some of which I have tried.

ORIGINAL BENCHY


UPDATE: I have now also checked the tension on the belt on the X axis and the belt under the plate, both seem ok