You could rent a cheapo instance at a cloud provider and tunnel https over ssh.
That’s basically undetectable. Long lived ssh connection? Totally normal. Lots of throughput? Also normal. Bursts throughput? Same.
Not sure how to do this on mobile.
Tailscale might be an option too (they have a free account for individuals and an exit node out of country nearly bypasses your problem) It uses wireguard which might not be blocked and which comes with some plausible deniability. It’s a secure network overlay not a VPN. It just connects my machines, honest officer.