Ender 3 V3 KE shifting layers after pause

I presume you have got into the system? There are other good guides, e.g. on that step, e.g.

Note that things are case-sensitive. First try

grep 'set y_park = [0-9][0-9][0-9]' /usr/data/printer_data/config/gcode_macro.cfg

That should be 255 if you have the issue. You can either use “vi” to edit directly, or you can try the following to edit the file in-place

sed -i 's,set y_park = 255,set y_park = 150,' /usr/data/printer_data/config/gcode_macro.cfg

Rerun the grep to check it’s now 150