Awww I'm so sorry, dude.

I know the struggle. My only advice for the future is to come online
as early as possible. If it says 9am, it means that people will already be queueing like at 7.30. You will be in a queue as well and you need to be careful to have a good connection and
not ever to refresh the page until you are allowed to buy your tickets. For me, it usually lasts from 7.30 or 8am, I get in line and wait, and then I'm able to take my tickets between 9.30 and 11am. It sucks, but that is the reality of it.
Also, check if the band doesn't have early tickets for fans or subscribers to their newsletter for free (like Metallica does).
Do not give up, though. If there is a waiting list for tickets, you need to get on it asap. I've always had the possibility to buy tickets later while on the waiting list. Also check from time to time the website that sells the tickets and the band's news, they often add tickets later, until the day before the concert!
Near the date of the concert you could eventually look on social media if some people didn't cancel and want to sell their tickets at the same price, though I have never done that and of course it can be dangerous, so I'm just saying it's a possibility, but not recommending. :P
I hope this helps a little for next time. Do they tour somewhere else that you perhaps could travel to?