[Help] FB Blocks

Hello everyone, I have bought a few 2 years aged accounts and when I try to change my Name on the profile, I get banned.
What I did?
I login on it with a new device machine, with a US proxy per account, with unique images for profiles, I added my profile information (work, study, brazillian local).

I think you should use the account on that IP like any normal user would do ..
Just use the account (post status updates / images ... like some stuff ) don't change anything for some time and don't post links untill That IP gains some trust from facebook