About SG support

Wait because a second ticket for the same thing will not expedite things. It's like Veebles said: it's a holiday period now with less support activity.

10 days ago

one my open ticket is old like 1,5 year xD 14 august 2016

A new ticket would get added to the back of the viewing queue, meaning that it wouldn't be viewed until after your initial ticket was viewed. As such, the only thing it'd accomplish is delaying staff later on. Likewise, bumping your old ticket moves it to the back of the queue, so same effect.
Short of editing your ticket's title to "URGENT: Please change my region before the Steam Sale ends!", there's not much you can do.

But, as mentioned above, region typically doesn't factor in to things much, especially since Steam made it so that nearly noone posts Steam purchases on the site anymore. Unless you're trying to get synced for a specific group or event, you're unlikely to end up having much need for it [I've yet to encounter a single region-restricted giveaway this season, other than for some keys from specific bundles, nor can I find any visible to me now. Likewise, being that I'm in the States, I should be a good position to see both the giveaways which restrict low-currency regions and the ones which restrict Europe].