That really depends on how much you value your account's progress so far. I would actually create a new account for re-rolling, and ask your friend to see if he would accept a new account in place of your old one, the burden of a newbie account shouldn't be too much if you give the account a few weeks, and proper planning of your AP/ BP expenditure and hime levelling.
Perhaps it's time to read up more on computer stuff, but VPN is really easy. I use Betternet VPN (use whatever free software you come across, but make sure you have antivirus active), it's a matter of following whatever instructions the download gives, then booting up the application. I turn it on to change my IP address, create accounts, and then turn it off once I hit the ban. Turning the application on the next time uses a separate IP address so you can continue to create more accounts. As for emails, a fake email will do when you start a nutaku ID, and once you actual roll something desirable, you can link your nutaku ID to a real email. Also, while you're at it, please delete trash accounts with this link: so you don't overload Nutaku servers with trash, which I guarantee you'll create while rerolling.
6 month is more than enough time to make and stabilise a new account IMO, I managed to pull myself to rank 50 in a month (well I did cash on a miracle ticket, so take this with a pinch of salt?). Like I said earlier, plan your AP/ BP expenditure carefully and your progress should be solid. Patience is key though, I spent a few days creating over 200 accounts just to get my current SSR heavy account.
Good luck out there m8