Can i appeal bans from over 2 years ago?

It doesn't hurt to try appealing it! In the worst case you will have the expired ban, that shouldn't mean anything - but if you you appeal it succesfully it will be removed from the list.

Here is the link to forums section where you should post your appeal

And here is the form itself!

Also, if you believe it was a mistake on staff side, you can fill out a complaint using this form