Stick with my old account?

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Well, First thing I'd do is have them disable the ID on the account. how ? That way they can't re-hack you.
Secondly, Change the e-mail to that of the one you were planning to use for a new account. yeah I'll do that and I've already changed PW.
Third, Change your password if you haven't already.

Really, With those 3, you shouldn't get hacked again. I wouldn't throw away those months/years of work even if they are equipless, its the time and effort (and money for perma nx) that you put into them that will have the memories. If you want to have a fresh start then just make some new chars on a new server.

Considering some of the things I've seen lately, I don't know. How did you get hacked? This one time I think I might have been at fault it was most logicaly a keylogger from an Ad despite my best efforts to keep my self anonymous/safe There have been some really strange things going on lately that would indicate it really wouldn't make a difference... but, if perhaps there were some sort of database leak, providing it's not an ongoing thing, a new account wouldn't be on that list, I guess, if you want to try it.

My instinct says to just stick with your old account though, because I feel it's pretty hit or miss whether they find you or not.