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indeed the lines are too far apart. Print some 5 square patterns releasing the 4 knobs the same amount (measuring by its dents) until the center one has fused lines when you remove it from the surface. You could also update your firmware (excellent work by this user: https://www.thingiverse.com/thing:3249319) to get software mesh leveling, as many beds seam to be concave.
Try strengthening the pressure on you extruder spring a bit (could be an easy fix). Exchange stepper drivers (one Z for the extruder) to see if the problem is there.

Anycubic i3 Mega / Mega-S Marlin 1.1.9 Custom Firmware - Extra Features & Quality Tweaks