A lot of settings can be tweaked… provide more info about your machine type, filament, slicer and settings…
It sounds like you are too close already. Can you slide a business card between the nozzle and PEI bed surface? Should be some slight resistance. Once you establish this, use the Z-code offset in your slicer software to tweak nozzle height. If you find a good offset, you can try translating back into your endstop knob (I generally use quarter turn = ~.1mm change)
If you’re printing ABS and its not adhering to the PEI bed, give it a sanding with a fine grit to revitalize.
Try printing the attached disc, and inspect the bottom for uniform extrusion infill pattern. It can help determine if the bed is level.
Post a picture of the bottom of a calibration cube. Members of the community can critique and advise better.
-Calib Disc 100x1.5.stl (95.2 KB)