[niin]

Why would your chances be worse because you won in the past? Do the lottery balls 'remember' you and hate you now because you won 6 years ago, and magically know what numbers you've picked and conspire to not bring up your numbers?

Lottery balls don't have a memory.

Sorry for the dramatic tone, but it makes no sense that you'd have a worse chance now simply because you won previously.

In fact, since you won previously, you might get more people buying in and, thus, might collectively have a better chance of winning (the more entries you buy, the better your microscopic chances are).