Well, I don't know you but in general I think chance is pretty high that people who have these kind of prices don't really have such a price in reality or will let someon “win“ who they know so that it's not really a giveaway.
So showing at least a video about the console we can win should be your first step. That still doesn't mean that people can win it but at least we know that it even exists. You aren't Pewdiepie or Sony where people know that the price is obviously real.
I mean, even in the best case scenario the chance would be 1% to win but considering that probably most who did something similar didn't even have that product or will simply annonce a fake name or friend as winner, the chance is maybe 0,05% in reality so yeah, post at least a video of the sealed console if you really want people to trust you when they never heard anything about you before.
That would obviously also help your account to get mor subs so that it's only logical to do so. You should know thaat as someone who thinks from himself that he did already so much right with this channel.
That's nothing against you personally, just take it as tip for those who try to increase their subs with prices people can really win which hopefully includes you.