Even if you want to hide your VPN usage from ISP, you can use VPN with obfuscated servers like ProtonVPN with Stealth mode or setup OpenVPN with obfsproxy.
ProtonVPN servers can also be exported as OpenVPN profiles. None will work in eg. China, unfortunately.
But ProtonVPN's obfuscated servers work in Russia, Iran and Egypt.
China is a very individual case, sometimes some VPNs work in China, sometimes - not. At the moment, Astrill VPN is very popular in online Chinese communities. Chinese usually use Shadowsocks, V2Ray, Xray, Trojan, VLESS, or gRPC to bypass Great Firewall of China.
By the way it's a good idea to add in my thread VPNs or methods that work in China to bypass their internet cencorship.