Hello
When i was first starting i made so many mistakes it is a part of learning.
i don't have a cr touch but i have a bl touch and when i was setting up the z offset i realized that once leveling it moved up 5mm. so to set the z offset maybe try to see if the nozzle goes up after leveling( you should be able to see on the LCD the z possession). than you can move it back down to 0 using the LCD. you could also try doing a manual bed level.
Have a great day