How to avoid DDoS Attack

I buy my train ticket from our railway local web site. When ticket open for sale on web site then web site original traffic remain 50 (Just an example). Our railway web site is attacked by DDoS for this reason ticket opening time traffic show (50x50=2500). That’s why I cannot buy my ticket from our railway website. There is any way avoid DDoS attack and easily buy my ticket. My Internet Speed is 1mbps and I also try to use high quality VPN but result 0. Any kinds of help are appreciated. Thank you