Use the open-source SoftEther VPN. It sends your traffic over software-defined Ethernet wrapped in HTTPS. https://en.m.wikipedia.org/wiki/SoftEther_VPN

Here's a list of public instances hosted by volunteers: https://www.vpngate.net/en/

For anyone reading this who still lives in a somewhat free country and has resources to spare, please consider hosting a public instance or mirroring the VPN Gate site.