1. Download Tor Browser from https://www.torproject.org/download/
2. Visit the site in Tor Browser
3. Tell everyone you know about 1 and 2, and remind them that if they ever actually "verify their age" or any other bullshit, they're likely to have their identity stolen and their details leaked. Never do this. Tell the government to suck a fat one.
4. Use https://www.writetothem.com/ to write to your MP and tell them to repeal the Online Safety Act. It's a censorship and surveillance regime, it makes nobody any safer.
5. Consider joining https://www.openrightsgroup.org/
6. Vote Labour out of power at the next election. Tell all the other parties that they'll have your vote if they repeal the Online Safety Act
Honestly I assumed imgur blocked tor exits, but you're right, it doesn't (at least not in my test just now).
I configured my host-based proxy multiplexer to use tor for *.imgur.com, and now I'm free!