I want to ask

how to build trust here?
I think the build trust with buy to someone, but I was wrong

and I get negative feedback from
jonald_fyookballhow to remove the negative feedback? I've apologized to him
*sorry for my english
Being a trustworthy person and time are the only way to build trust.
You are now at -6 so you have a bit of an uphill climb, but you can still become trustworthy, and jonald may remove the feedback in the future.
Or you can just create a new account and start again with a clean slate.