Fiverr activity should be the most important. The buyer comes here and searches online active sellers for emergency contact. Here you win when you are active.
Auto-reply will also help sellers, sometimes we are not available on Fiverr and we get messages and orders and we can not respond to them and this will decrease the response rate.
I don't recommend this trick.
Don't copy other images, gig descriptions, or other things. Just saw your own creativity.
You should follow Fiverr terms and conditions: https://www.fiverr.com/terms_of_service?source=footer
Yes, you can. You always remember if your gig is on the rank on the page of 1,2,3 don't edit. You should edit one page by one page after 12 hours. Don't risk ranking gig.