I don't think it's a good choice since you are going to use financial services. A gambling casino website is one kind of financial service. If the service provider blocked you. That means there is something wrong. Even if you can access them in a different way, There is always a chance of losing your money.
Since Blackjack already mentioned that,
Is VPN use allowed?
VPN in general is for user protection and security in internet but if domain blackjack.fun is blocked in your country then unfortunately we have to say NO to you. So, I guess it's better not to suggest to anyone something like that. If they get any financial damage, They might say it's happened just because of your suggestion.