Sorry to hear that man. Internet censorship is really stupid and wrong and leads only to bad things.
Unfortunately there is no way to do that at the moment with Bisq alone. Eventually Bisq might use Tor Bridges that are designed to fight Tor blocking, but it didn't work vary well last time, at least not with China.
You can try to use VPNs if there are some that aren't blocked in your country, or make your own VPN with someone you know that lives in a country with free Internet access. Maybe setup some system wide proxies or something. I am not sure how you can do it, since I always had a free access to Tor in my country, but it can always be done, there is no way to stop it, it just might take more work than you are willing to put in. You should search the Internet for more help.